# Circuit Analysis I (ENGR 2405) Chapter 1 Review: Charge, Current, Voltage, Power

Size: px
Start display at page:

Download "Circuit Analysis I (ENGR 2405) Chapter 1 Review: Charge, Current, Voltage, Power"

Transcription

1 Circuit Analysis I (ENGR 2405) Chapter 1 Review: Charge, Current, Voltage, Power

2 What is a circuit? An electric circuit is an interconnection of electrical elements. It may consist of only two elements or many more: 2

3 Units When taking measurements, we must use units to quantify values We use the International Systems of Units (SI for short) Prefixes on SI units allow for easy relationships between large and small values 3

4 Electric Charge When an amber rod is rubbed with fur, some of the electrons on the atoms in the fur are transferred to the amber:

5 Electric Charge: Water (H2O) molecule can be polarized by electrostatic Induction For example, the water molecule has more positive charges on one side of the molecule and negative charges on the other side. Thus, water can be slightly attracted to a static electric charge. A demonstration of that can be seen in bending a stream of water with a charged plastic comb.

6 Electric Charge:

7 Conductors and Insulators

8 Electric Charge Some materials can become polarized this means that their atoms rotate in response to an external charge. This is how a charged object can attract a neutral one.

9 Electric Charge The electrons in an atom are in a cloud surrounding the nucleus, and can be separated from the atom with relative ease.

10 Electric Charge We find that the total electric charge of the universe is a constant: Electric charge is conserved. Also, electric charge is quantized in units of e. The atom that has lost an electron is now positively charged it is a positive ion The atom that has gained an electron is now negatively charged it is a negative ion

11 21.5 Charge is Quantized Many descriptions of electric charge use terms that might lead you to the conclusion that charge is a substance. Phrases like: Charge on a sphere Charge transferred Charge carried on the electron However, charge is a property of particles, one of many properties, such as mass.

12 Charge is Quantized. Since the days of Benjamin Franklin, our understanding of of the nature of electricity has changed from being a type of continuous fluid to a collection of smaller charged particles. The total charge was found to always be a multiple of a certain elementary charge, e : The value of this elementary charge is one of the fundamental constants of nature, and it is the magnitude of the charge of both the proton and the electron. The value of e is:

13 Charge is Quantized Elementary particles either carry no charge, or carry a single elementary charge. When a physical quantity such as charge can have only discrete values, rather than any value, we say the quantity is quantized. It is possible, For example, to find a particle that has no charge at all, or a charge of +10e, or -6e, but not a particle with a charge of, say, 3.57e.

14 Conductors and Insulators Conductors are materials through which charge can move freely; examples include metals (such as copper in common lamp wire), the human body, and tap water. Nonconductors also called insulators are materials through which charge cannot move freely; examples include rubber, plastic, glass, and chemically pure water. Semiconductors are materials that are intermediate between conductors and insulators; examples include silicon and germanium in computer chips. Superconductors are materials that are perfect conductors, allowing charge to move without any hindrance. The properties of conductors and insulators are due to the structure and electrical nature of atoms. Atoms consist of positively charged protons, negatively charged electrons, and electrically neutral neutrons. The protons and neutrons are packed tightly together in a central nucleus. When atoms of a conductor come together to form the solid, some of their outermost (and so most loosely held) electrons become free to wander about within the solid, leaving behind positively charged atoms ( positive ions).we call the mobile electrons conduction electrons. There are few (if any) free electrons in a nonconductor.

15 Charge Charge is a basic SI unit, measured in Coulombs (C) Counts the number of electrons (or positive charges) present. Charge of single electron is 1.602*10-19 C One Coulomb is quite large, 6.24*10 18 electrons. 15

16 Charge II In the lab, one typically sees (pc, nc, or μc) Charge is always multiple of electron charge Charge cannot be created or destroyed, only transferred. 16

17 Electric Current: Although an electric current is a stream of moving charges, not all moving charges constitute an electric current. If there is to be an electric current through a given surface, there must be a net flow of charge through that surface. Two examples are given. 1. The free electrons (conduction electrons) in an isolated length of copper wire are in random motion at speeds of the order of 106 m/s. If you pass a hypothetical plane through such a wire, conduction electrons pass through it in both directions at the rate of many billions per second but there is no net transport of charge and thus no current through the wire. However, if you connect the ends of the wire to a battery, you slightly bias the flow in one direction, with the result that there now is a net transport of charge and thus an electric current through the wire.

18 Electric Current:

19 Electric Current: The figure shows a section of a conductor, part of a conducting loop in which current has been established. If charge dq passes through a hypothetical plane (such as aa ) in time dt, then the current i through that plane is defined as: The charge that passes through the plane in a time interval extending from 0 to t is: Under steady-state conditions, the current is the same for planes aa, bb, and cc and for all planes that pass completely through the conductor, no matter what their location or orientation. The SI unit for current is the coulomb per second, or the ampere (A):

20 Electric Current, Conservation of Charge, and Direction of Current:

21 Current The movement of charge is called a current Historically the moving charges were thought to be positive Thus we always note the direction of the equivalent positive charges, even if the moving charges are negative. 21

22 Current II Current, i, is measured as charge moved per unit time through an element. i dq dt Unit is Ampere (A), is one Coulomb/second 22

23 DC vs. AC A current that remains constant with time is called Direct Current (DC) Such current is represented by the capital I, time varying current uses the lowercase, i. A common source of DC is a battery. A current that varies sinusoidally with time is called Alternating Current (AC) Mains power is an example of AC 23

24 Direction of current The sign of the current indicates the direction in which the charge is moving with reference to the direction of interest we define. We need not use the direction that the charge moves in as our reference, and often have no choice in the matter. 24

25 Direction of Current II A positive current through a component is the same as a negative current flowing in the opposite direction. 25

26 Electric Potential: The potential energy per unit charge at a point in an electric field is called the electric potential V (or simply the potential) at that point. This is a scalar quantity. Thus, The electric potential difference V between any two points i and f in an electric field is equal to the difference in potential energy per unit charge between the two points. Thus, The potential difference between two points is thus the negative of the work done by the electrostatic force to move a unit charge from one point to the other. If we set U i =0 at infinity as our reference potential energy, then the electric potential V must also be zero there. Therefore, the electric potential at any point in an electric field can be defined to be Here W is the work done by the electric field on a charged particle as that particle moves in from infinity to point f. The SI unit for potential is the joule per coulomb. This combination is called the volt (abbreviated V).

27 Voltage Electrons move when there is a difference in charge between two locations. This difference is expressed at the potential difference, or voltage (V). It is always expressed with reference to two locations 27

28 Voltage II It is equal to the energy needed to move a unit charge between the locations. Positive charge moving from a higher potential to a lower yields energy. Moving from negative to positive requires energy. 28

29 Power in Electric Circuits: In the figure, there is an external conducting path between the two terminals of the battery. A steady current i is produced in the circuit, directed from terminal a to terminal b. The amount of charge dq that moves between those terminals in time interval dt is equal to i dt. This charge dq moves through a decrease in potential of magnitude V, and thus its electric potential energy decreases in magnitude by the amount The power P associated with that transfer is the rate of transfer du/dt, given by The unit of power is the volt-ampere (V A).

30 Energy and Power in Electric Circuits When the electric company sends you a bill, your usage is quoted in kilowatt-hours (kwh). They are charging you for energy use, and kwh are a measure of energy.

31 Power and Energy Voltage alone does not equal power. It requires the movement of charge, i.e. a current. Power is the product of voltage and current p vi It is equal to the rate of energy provided or consumed per unit time. It is measured in Watts (W) 31

32 Passive Sign Convention By convention, we say that an element being supplied power has positive power. A power source, such as a battery has negative power. Passive sign convention is satisfied if the direction of current is selected such that current enters through the terminal that is more positively biased. 32

33 Conservation of Energy In a circuit, energy cannot be created or destroyed. Thus power also must be conserved The sum of all power supplied must be absorbed by the other elements. Energy can be described as watts x time. Power companies usually measure energy in watt-hours 33

34 Circuit Elements Two types: Active Passive Active elements can generate energy Generators Batteries Operational Amplifiers 34

35 Circuit Elements II Passives absorb energy Resistors Capacitors Inductors But it should be noted that only the resistor dissipates energy ideally. The inductor and capacitor do not. 35

36 Ideal Voltage Source An ideal voltage source has no internal resistance. It also is capable of producing any amount of current needed to establish the desired voltage at its terminals. Thus we can know the voltage at its terminals, but we don t know in advance the current. 36

37 Ideal Current Source Current sources are the opposite of the voltage source: They have infinite resistance They will generate any voltage to establish the desired current through them. We can know the current through them in advance, but not the voltage. 37

38 Ideal sources Both the voltage and current source ideally can generate infinite power. They are also capable of absorbing power from the circuit. It is important to remember that these sources do have limits in reality: Voltage sources have an upper current limit. Current sources have an upper voltage limit. 38

39 Dependent Sources A dependent source has its output controlled by an input value. Symbolically represented as a diamond Four types: A voltage-controlled voltage source (VCVS). A current-controlled voltage source (CCVS). A voltage-controlled current source (VCCS). A current-controlled current source (CCCS). 39

40 Dependent Source example The circuit shown below is an example of using a dependent source. The source on the right is controlled by the current passing through element C. 40

41 Circuit Applications of Dependent Sources Dependent sources are good models for some common circuit elements: Transistors: In certain modes of operation, transistors take either a voltage or current input to one terminal and cause a current that is somehow proportional to the input to appear at two other terminals. Operational Amplifiers: Not covered yet, but the basic concept is they take an input voltage and generate an output voltage that is proportional to that. 41

42 TV Picture Tube Old style cathode Ray Tubes (CRT) are a good example of the flow of electrons A hot filament is the source of electrons Charged plates accelerate and steer a thin stream (beam) of electrons The beam strikes a phosphor coated screen causing light emission. 42

### Chapter 21. Electric Charge

Chapter 21 Electric Charge Electric Charge When an amber rod is rubbed with fur, some of the electrons on the atoms in the fur are transferred to the amber: Electric Charge: Water (H2O) molecule can be

### ENGR 2405 Class No Electric Circuits I

ENGR 2405 Class No. 48056 Electric Circuits I Dr. R. Williams Ph.D. rube.williams@hccs.edu Electric Circuit An electric circuit is an interconnec9on of electrical elements Charge Charge is an electrical

Chapter 21 Coulomb s Law Copyright Magic? (a) The two glass rods were each rubbed with a silk cloth and one was suspended by thread. When they are close to each other, they repel each other. (b) The plastic

### CHAPTER ONE. 1.1 International System of Units and scientific notation : Basic Units: Quantity Basic unit Symbol as shown in table 1

CHAPTER ONE 1.1 International System of Units and scientific notation : 1.1.1 Basic Units: Quantity Basic unit Symbol as shown in table 1 Table 1 1.1.2 Some scientific notations : as shown in table 2 Table

### FXA 2008 ELECTRIC CHARGE (Q) 1. Candidates should be able to : Electric charge is a property possessed by protons and electrons.

ELECTRIC CHARGE (Q) 1 Candidates should be able to : Explain that electric current is a net flow of charged particles. Explain that electric current in a metal is due to the movement of electrons, whereas

### Objective of Lecture Discuss resistivity and the three categories of materials Chapter 2.1 Show the mathematical relationships between charge,

Objective of Lecture Discuss resistivity and the three categories of materials Chapter 2.1 Show the mathematical relationships between charge, current, voltage, and energy. Chapter 2.2-2.4 Define resistance

### 2. Basic Components and Electrical Circuits

1 2. Basic Components and Electrical Circuits 2.1 Units and Scales The International System of Units (SI) defines 6 principal units from which the units of all other physical quantities can be derived

### History. The word electricity comes from the Greek elektron which means amber. The amber effect is what we call static electricity.

Electrostatics 1 History The word electricity comes from the Greek elektron which means amber. The amber effect is what we call static electricity. 2 ELECTROSTATICS the study of electric charges, forces

### PHYSICS - Electrostatics

PHYSICS - Electrostatics Electrostatics, or electricity at rest, involves electric charges, the forces between them, and their behavior in materials. 22.1 Electrical Forces and Charges The fundamental

### Charge The most basic quantity in an electric circuit is the electric charge. Charge is an electrical property of the atomic particles of which matter

Basic Concepts of DC Circuits Introduction An electric circuit is an interconnection of electrical elements. Systems of Units 1 Charge The most basic quantity in an electric circuit is the electric charge.

### BFF1303: ELECTRICAL / ELECTRONICS ENGINEERING

BFF1303: ELECTRICAL / ELECTRONICS ENGINEERING Introduction Ismail Mohd Khairuddin, Zulkifil Md Yusof Faculty of Manufacturing Engineering Universiti Malaysia Pahang Introduction BFF1303 ELECTRICAL/ELECTRONICS

### Note on Posted Slides

Note on Posted Slides These are the slides that I intended to show in class on Wed. Mar. 13, 2013. They contain important ideas and questions from your reading. Due to time constraints, I was probably

### Electric Force and Charges. Conceptual Physics 11 th Edition. Electric Force and Charges

Conceptual Physics 11 th Edition Central rule of electricity Opposite charges attract one another; like charges repel. Chapter 22: ELECTROSTATICS This lecture will help you understand: Electrical Forces

### Electric Force and Charges. Conceptual Physics 11 th Edition. What are Atoms Made of?

Conceptual Physics 11 th Edition Electrical Forces and Charges Conservation of Charge Coulomb s Law Conductors and Insulators Chapter 22: ELECTROSTATICS Charging Charge Polarization Electric Field Electric

### Electrical Forces arise from particles in atoms.

Electrostatics Electrical Forces arise from particles in atoms. The protons(+) in the nucleus attract the electrons and hold them in orbit Electrons(-)repel other electrons and protons repel other protons

### Electric Charge. Electric Charge ( q ) unbalanced charges positive and negative charges. n Units Coulombs (C)

Electric Charge Electric Charge ( q ) unbalanced charges positive and negative charges n Units Coulombs (C) Electric Charge How do objects become charged? Types of materials Conductors materials in which

### Conceptual Physical Science 6 th Edition

Conceptual Physical Science 6 th Edition Chapter 8: STATIC AND CURRENT ELECTRICITY 1 Chapter 8: STATIC AND CURRENT ELECTRICITY Chapter 8: Read: All Homework: Four problems from the following set: 4, 6,

### Electricity

Electricity Electric Charge There are two fundamental charges in the universe. Positive (proton) has a charge of +1.60 x 10-19 C Negative (electron) has a charge of 1.60 x 10-19 C There is one general

### Test Review Electricity

Name: Date: 1. An operating television set draws 0.71 ampere of current when connected to a 120-volt outlet. Calculate the time it takes the television to consume 3.0 10 5 joules of electric energy. [Show

### ELECTRICITY. Chapter ELECTRIC CHARGE & FORCE

ELECTRICITY Chapter 17 17.1 ELECTRIC CHARGE & FORCE Essential Questions: What are the different kinds of electric charge? How do materials become charged when rubbed together? What force is responsible

### Properties of Electric Charge

1 Goals 2 Properties of Electric Charge 2 Atomic Structure: Composed of three main particles: 1. Proton 2. Neutron 3. Electron Things to Remember: 3 Everything is made of atoms. Electrons can move from

### Learning Outcomes from Last Time. Class 3. Learning Outcomes. What Causes Forces -Two Experiments. What Causes Forces -Two Experiments

Learning Outcomes from Last Time Class 3 Electrostatic Forces Physics 106 Winter 2018 Press CTRL-L to view as a slide show. You should be able to answer these questions: What is science? What is physics?

### Name: Class: Date: 1. Friction can result in the transfer of protons from one object to another as the objects rub against each other.

Class: Date: Physics Test Review Modified True/False Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true. 1. Friction can result in

### PH 222-2C Fall 2012 ELECTRIC CHARGE. Lecture 1. Chapter 21 (Halliday/Resnick/Walker, Fundamentals of Physics 8 th edition)

PH 222-2C Fall 2012 ELECTRIC CHARGE Lecture 1 Chapter 21 (Halliday/Resnick/Walker, Fundamentals of Physics 8 th edition) 1 Chapter 21 Electric Charge In this chapter we will introduce a new property of

### What is electricity? Charges that could be either positive or negative and that they could be transferred from one object to another.

Electricity What is electricity? Charges that could be either positive or negative and that they could be transferred from one object to another. What is electrical charge Protons carry positive charges

### Chapter 1. Electrostatics. The Electric Charge

Chapter 1 Electrostatics The Electric Charge Electric charge, or electricity, can come from batteries and generators. But some materials become charged when they are rubbed. Their charge is sometimes called

### Section 1 Electric Charge and Force

CHAPTER OUTLINE Section 1 Electric Charge and Force Key Idea questions > What are the different kinds of electric charge? > How do materials become charged when rubbed together? > What force is responsible

### Electricity Courseware Instructions

Physics Electricity Courseware Instructions This courseware acts as a supplement to the classroom instruction. The five sections on the following slide link to the topic areas. Following the topic area

### Static and Current Electricity

Static and Current Electricity Fundamentals of Physics copyright 10x10learning.com 1 Topics that can be grouped for ease of learning Measurement and Laws of Motion Fluids, Atmospheric Pressure, Heat and

### Notes on Electricity (Circuits)

A circuit is defined to be a collection of energy-givers (batteries) and energy-takers (resistors, light bulbs, radios, etc.) that form a closed path (or complete path) through which electrical current

### Electricity. Chapter 21

Electricity Chapter 21 Electricity Charge of proton Positive Charge of electron Negative Charge of neutron NONE Atoms have no charge because the charges of the protons and electrons cancel each other out.

### Introduction to Electrical Theory and DC Circuits

Introduction to Electrical Theory and DC Circuits For Engineers of All Disciplines by James Doane, PhD, PE Contents 1.0 Course Overview... 4 2.0 Fundamental Concepts... 4 2.1 Electric Charges... 4 2.1.1

### ALABAMA SCHOOL OF FINE ART, 8 TH GRADE HONORS PHYSICS QUIZ : ELECTROSTATICS TIME: 90 MINUTES NAME

1 ALABAMA SCHOOL OF FINE ART, 8 TH GRADE HONORS PHYSICS QUIZ 4-18-2016: ELECTROSTATICS TIME: 90 MINUTES NAME COVERAGE: ELECTRIC CHARGE, ELECTROSTATIC FORCE (COULOMB S LAW ), ELECTRIC POTENTIAL, ELECTRIC

### ELECTROSTATICS. the study of electric charges, forces and fields Static Electricity is Stationary Electricity or Accumulation of charge

Electrostatics 1 ELECTROSTATICS the study of electric charges, forces and fields Static Electricity is Stationary Electricity or Accumulation of charge Fundamental Rule Opposites attract, Likes Repel Things

### Section 1: Electric Fields

PHY 132 Outline of Lecture Notes i Section 1: Electric Fields A property called charge is part of the basic nature of protons and electrons. Large scale objects become charged by gaining or losing electrons.

### Chapter 02. Voltage and Current. Atomic Theory Review. Atomic Theory Review. Atomic Theory Review. Electrical Charge.

Chapter 02 Voltage and Current Atom Atomic Theory Review Contains a nucleus of protons and neutrons Nucleus is surrounded by a group of orbiting electrons Electrons are negative, protons are positive Electrically

### Electric charges. Basics of Electricity

Electric charges Basics of Electricity Electron has a negative charge Neutron has a no charge Proton has a positive charge But what is a charge? Electric charge, like mass, is a fundamental property of

### Notes on Electricity (Circuits)

A circuit is defined to be a collection of energy-givers (active elements) and energy-takers (passive elements) that form a closed path (or complete path) through which electrical current can flow. The

### Electric charge is conserved the arithmetic sum of the total charge cannot change in any interaction.

Electrostatics Electric charge is conserved the arithmetic sum of the total charge cannot change in any interaction. Electric Charge in the Atom Atom: Nucleus (small, massive, positive charge) Electron

### 6. In a dry cell electrical energy is obtained due to the conversion of:

1. If a wire of uniform area of cross section is cut into two halves (equal in size), the resistivity of each part will be: a) Halved. b) Doubled. c) Becomes four times its initial value. d) Remains the

### Chapter 26 Current and Resistance

Chapter 26 Current and Resistance Electric Current Although an electric current is a stream of moving charges, not all moving charges constitute an electric current. If there is to be an electric current

### Section 12. Please pick-up section 12 packet and worksheet

Section 12 Please pick-up section 12 packet and worksheet Electrostatics Electrostatics, or electricity at rest, involves electric charges, the forces between them, and their behavior in materials. An

### What does it mean for an object to be charged? What are charges? What is an atom?

What does it mean for an object to be charged? What are charges? What is an atom? What are the components of an atom? Define the following: Electric Conductor Electric Insulator Define the following: Electric

### Lecture Outline Chapter 19. Physics, 4 th Edition James S. Walker. Copyright 2010 Pearson Education, Inc.

Lecture Outline Chapter 19 Physics, 4 th Edition James S. Walker Chapter 19 Electric Charges, Forces, and Fields Units of Chapter 19 Electric Charge Insulators and Conductors Coulomb s Law The Electric

### CHAPTER 15 PRE-TEST: ELECTRIC FORCE AND FIELDS

Class: Date: CHAPTER 5 PRE-TEST: ELECTRIC FORCE AND FIELDS Multiple Choice Identify the choice that best completes the statement or answers the question.. What happens when a rubber rod is rubbed with

### Introduction to Electric Circuit Analysis

EE110300 Practice of Electrical and Computer Engineering Lecture 2 and Lecture 4.1 Introduction to Electric Circuit Analysis Prof. Klaus Yung-Jane Hsu 2003/2/20 What Is An Electric Circuit? Electrical

### Revision checklist SP10. SP10 Electricity and Circuits. SP10a Electric circuits. SP10b Current and potential difference

Electricity and Circuits a Electric circuits Describe the basic structure of an atom (positions, relative masses and relative charges of protons, neutrons and electrons). Recognise the circuit symbols

### HW Chapter 16 Q 6,8,10,18,19,21 P 1,2,3,4. Chapter 16. Part 1: Electric Forces and Electric Fields. Dr. Armen Kocharian

HW Chapter 16 Q 6,8,10,18,19,21 P 1,2,3,4 Chapter 16 Part 1: Electric Forces and Electric Fields Dr. Armen Kocharian First Observations Greeks Observed electric and magnetic phenomena as early as 700 BC

### Electricity Mock Exam

Name: Class: _ Date: _ ID: A Electricity Mock Exam Multiple Choice Identify the letter of the choice that best completes the statement or answers the question.. What happens when a rubber rod is rubbed

### 16.1 Electrical Current

16.1 Electrical Current Electric Current Electric Current When the ends of an electric conductor are at different electric potentials, charge flows from one end to the other Flow of Charge Charge flows

### King Saud University College of Science Physics & Astronomy Dept. PHYS 111 (GENERAL PHYSICS 2) CHAPTER 23: Electric Fields LECTURE NO.

King Saud University College of Science Physics & Astronomy Dept. PHYS 111 (GENERAL PHYSICS 2) CHAPTER 23: Electric Fields LECTURE NO. 2 23.1 Properties of Electric Charges A number of simple experiments

### What is an Electric Current?

Electric Circuits NTODUCTON: Electrical circuits are part of everyday human life. e.g. Electric toasters, electric kettle, electric stoves All electrical devices need electric current to operate. n this

### Chapter 15. Electric Forces and Electric Fields

Chapter 15 Electric Forces and Electric Fields First Observations Greeks Observed electric and magnetic phenomena as early as 700 BC Found that amber, when rubbed, became electrified and attracted pieces

### Objects can be charged by rubbing

Electrostatics Objects can be charged by rubbing Charge comes in two types, positive and negative; like charges repel and opposite charges attract Electric charge is conserved the arithmetic sum of the

### Chapter 15. Electric Forces and Electric Fields

Chapter 15 Electric Forces and Electric Fields First Studies Greeks Observed electric and magnetic phenomena as early as 700 BC Found that amber, when rubbed, became electrified and attracted pieces of

### Electricity. From the word Elektron Greek for amber

Electricity From the word Elektron Greek for amber Electrical systems have two main objectives: To gather, store, process, transport information & Energy To distribute and convert energy Electrical Engineering

### Electroscope Used to are transferred to the and Foil becomes and

Electricity Notes Chapter 17 Section 1: Electric Charge and Forces Electric charge is a variety of independent all with one single name. Electricity is related to, and both (-) and (+) carry a charge.

### EECE251 Circuit Analysis I Lecture Integrated Program Set 1: Basic Circuit Concepts and Elements

EECE5 Circuit Analysis I Lecture Integrated Program Set : Basic Circuit Concepts and Elements Shahriar Mirabbasi Department of Electrical and Computer Engineering University of British Columbia shahriar@ece.ubc.ca

### Chapter Electric Forces and Electric Fields. Prof. Armen Kocharian

Chapter 25-26 Electric Forces and Electric Fields Prof. Armen Kocharian First Observations Greeks Observed electric and magnetic phenomena as early as 700 BC Found that amber, when rubbed, became electrified

### UNIT V: Electricity and Magnetism Chapters 32-37

IMPORTANT TERMS: Charge Conductor Conservation of charge Coulomb Coulomb s Law Electrical force Electrically polarized Electrostatics Grounding Induced Induction Insulator Semiconductor superconductor

### c. They have electric charges that move freely d. Electrons are added to the rod a. charges are of unlike signs b. charges are of like signs

Physics Review Chapter 17 & 18 Name: Date: Period: 1. What sentence best characterizes electron conductors? a. They have low mass density b. They have high tensile strength c. They have electric charges

### Unit 3 Lesson 1 Electric Charge and Static Electricity. Copyright Houghton Mifflin Harcourt Publishing Company

Opposites Attract What is electric charge? Electric charge is a property that leads to electromagnetic interactions between the particles that make up matter. An object can have a positive (+) charge,

### Static Electricity. Electric Field. the net accumulation of electric charges on an object

Static Electricity the net accumulation of electric charges on an object Electric Field force exerted by an e - on anything that has an electric charge opposite charges attract like charges repel Static

### Electron Theory of Charge. Electricity. 1. Matter is made of atoms. Refers to the generation of or the possession of electric charge.

Electricity Refers to the generation of or the possession of electric charge. There are two kinds of electricity: 1. Static Electricity the electric charges are "still" or static 2. Current Electricity

### ELECTRON THEORY

ELECTRON THEORY We will start our discussion of electron theory with a few definitions. Matter- is anything that has mass and takes up space. The basic unit of matter is the atom. Another Definition Energy-

### Electric Charge. Labs, Activities & Demonstrations: Notes: Unit: Electricity & Magnetism NGSS Standards: N/A

Add Important Electric Charge Page: 424 NGSS Standards: N/A Electric Charge MA Curriculum Frameworks (2006): 5.1, 5.4 AP Physics 1 Learning Objectives: 1.B.1.1, 1.B.1.2, 1.B.2.1, 1.B.3.1 Knowledge/Understanding

### Fundamental of Electrical circuits

Fundamental of Electrical circuits 1 Course Description: Electrical units and definitions: Voltage, current, power, energy, circuit elements: resistors, capacitors, inductors, independent and dependent

### melectron= 9.1x10-31 kg e = 1.6x10-19 C MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

Exam #1, PHYS 102 Name Chapters 16, 17, & 18 8 February 2006 Constants k=9x109 Nm2/C2 e o =8.85x10-12 F/m mproton=1.673x10-27 kg melectron= 9.1x10-31 kg e = 1.6x10-19 C MULTIPLE CHOICE. Choose the one

### ES250: Electrical Science. HW1: Electric Circuit Variables, Elements and Kirchhoff s Laws

ES250: Electrical Science HW1: Electric Circuit Variables, Elements and Kirchhoff s Laws Introduction Engineers use electric circuits to solve problems that are important to modern society, such as: 1.

### E40M Charge, Current, Voltage and Electrical Circuits KCL, KVL, Power & Energy Flow. M. Horowitz, J. Plummer, R. Howe 1

E40M Charge, Current, Voltage and Electrical Circuits KCL, KVL, Power & Energy Flow M. Horowitz, J. Plummer, R. Howe 1 Reading For Topics In These Slides Chapter 1 in the course reader OR A&L 1.6-1.7 -

### Electric Charge. Labs, Activities & Demonstrations: Notes: Unit: Electricity & Magnetism NGSS Standards: N/A

Add Important Electric Charge Page: 44 NGSS Standards: N/A Electric Charge MA Curriculum Frameworks (006): 5.1, 5.4 AP Physics 1 Learning Objectives: 1.B.1.1, 1.B.1., 1.B..1, 1.B.3.1 Knowledge/Understanding

### Chapter 19 Electric Charges, Forces, and Fields

Chapter 19 Electric Charges, Forces, and Fields 1 Overview of Chapter 19 Electric Charge! Insulators and Conductors! Coulomb s Law! The Electric Field! Electric Field Lines! Shielding and Charging by Induction

### Electrostatics and Electric Potential - Outline

Electrostatics and Electric Potential - Outline 1. Understand the basic properties of electric charge, including conservation of charge and that charges are quantized. 2. Differentiate between conductors

### Chapter 23. Electric Fields

Chapter 23 Electric Fields Electric Charges There are two kinds of electric charges Called positive and negative Negative charges are the type possessed by electrons Positive charges are the type possessed

### Chapter 21 Electric Current and Direct- Current Circuits

Chapter 21 Electric Current and Direct- Current Circuits 1 Overview of Chapter 21 Electric Current and Resistance Energy and Power in Electric Circuits Resistors in Series and Parallel Kirchhoff s Rules

### Exercises Electrical Forces and Charges (pages )

Exercises 321 Electrical Forces and Charges (pages 645 646) 1 Circle the letter beside the correct comparison of the strengths of the gravitational force and the electrical force a The gravitational force

### People experience static electricity everyday.

Electrostatics Electrostatics/static electricity is the branch of physics that deals with electrical charges or charged objects, and their interactions. The charges are stationary. People experience static

### PHY132 Introduction to Physics II Class 8 Outline:

PHY132 Introduction to Physics II Class 8 Outline: Ch. 25, sections 25.1-25.4 Developing a Charge Model Electric Charge Insulators and Conductors Coulomb's Law [Photo by David He Aug. 9, 2009. http://www.flickr.com/photos/davidymhe/3809482563/

### Electric Force and Charge. Electric Force and Charge. Electric Force and Charge. Electric Force and Charge. Electric Force and Charge

Hewitt/Lyons/Suchocki/Yeh Conceptual Integrated Science Chapter 7 ELECTRICITY AND MAGNETISM Electric forces can attract some objects and repel others Electric charge: the fundamental quantity that underlies

### Unit 2: Fields. Substances that possessed an electric charge were noticed to show two different states; these were classified as either negative or

Unit 2: Fields Part 1: Electrostatics (Read section 524-534) Section I : Definition of Electrostatics Electrostatics is the study of electricity at rest. Early Greeks noticed that when a piece of sap or

### UNIT V: Electricity and Magnetism Chapters 32-37

IMPORTANT TERMS: Charge Conductor Conservation of charge Coulomb Coulomb s Law Electrical force Electrically polarized Electrostatics Grounding Induced Induction Insulator Semiconductor superconductor

### Review of Static Electricity

Name: KEY lock: Date: IP 670 Match each of the following terms with the appropriate description. Write the letter of the best answer to the left. Terms Description C 1. atom a. a small, negatively charged

### ELECTRICITY & MAGNETISM NOTES

ELECTRICITY & MAGNETISM NOTES PHYSICS B4B BAKERSFIELD COLLEGE Rick Darke (Instructor) CHARGE Electric charge is a fundamental property associated with 2 of the 3 subatomic particles making up most matter.

### Electromagnetism Review Sheet

Electromagnetism Review Sheet Electricity Atomic basics: Particle name Charge location protons electrons neutrons + in the nucleus - outside of the nucleus neutral in the nucleus What would happen if two

### Physics Worksheet Electrostatics, Electric Fields and Potential Section: Name: Electric Charges

Electric Charges 1. The fundamental rule of all electrical phenomena is: Like charges, opposite charges 2. Thomson s cathode ray experiment proved that: _ 3. Millikan s oil drop experiment proved that:

### Chapter 23. Electric Charge and Electric Field

Chapter 23 Electric Charge and Electric Field Goals for Chapter 23 To study electric charge and see how charge behaves in conductors and insulators To calculate force with Coulomb s Law To consider the

### Intro Video: n What is charge? n v=dvlpasdwxpy

Electrostatics Intro Video: n What is charge? n https://www.youtube.com/watch? v=dvlpasdwxpy What is electrostatics? n Electrostatics or electricity at rest n Involves electric charges, the forces between

### ECE2262 Electric Circuits. Chapter 1: Basic Concepts. Overview of the material discussed in ENG 1450

ECE2262 Electric Circuits Chapter 1: Basic Concepts Overview of the material discussed in ENG 1450 1 Circuit Analysis 2 Lab -ECE 2262 3 LN - ECE 2262 Basic Quantities: Current, Voltage, Energy, Power The

### ECE 2100 Circuit Analysis

ECE 2100 Circuit Analysis Lesson 3 Chapter 2 Ohm s Law Network Topology: nodes, branches, and loops Daniel M. Litynski, Ph.D. http://homepages.wmich.edu/~dlitynsk/ esistance ESISTANCE = Physical property

### Electrostatics. Electrical properties generated by static charges. Introduction

Electrostatics Electrical properties generated by static charges Introduction First Greek discovery Found that amber, when rubbed, became electrified and attracted pieces of straw or feathers Introduction

### Concept Summary. Adapted from Batesville High School Physics

Grounding Providing a path from a charged object to the Earth is called grounding it. Charges will be attracted from (or repelled to) the Earth by the charged object. Since the Earth is so large, both

### Review of Static Electricity

Name: Block: Date: IP 614 Review of Static Electricity Central Concept: Stationary and moving charged particles result in the phenomena known as electricity and magnetism. 5.1 Recognize that an electric

### Electrostatics. The Nature of Electric Charge

Electrostatics GIRL SAFELY CHARGED TO SEVERAL HUNDRED THOUSAND VOLTS GIRL IN GREAT DANGER AT SEVERAL THOUSAND VOLTS The Nature of Electric Charge Discovery of charge The Greeks first noticed electric charges

### TOPIC 4 STATIC ELECTRICITY

IGCSE Physics 0625 notes Topic 4: Static Electricity 1 TOPIC 4 STATIC ELECTRICITY ELECTRICITY: Electricity is the flow of electrical charges or power. The charges could be in the form of electrons or ions.

### Conceptual Physics Electrostatics and Static Electricity Notes and Worksheets

Conceptual Physics Electrostatics and Static Electricity Notes and Worksheets Electrostatics is the study of electrical charges at rest. Charge is the fundamental aspect of all electrical phenomena. Electrical

### A negatively charged object has more electrons than protons. A negatively charged object has more electrons than protons

Electricity Electricity Describes all phenomena caused by positive and negative charges Electrical charge is caused by protons and electrons Electrons and protons are subatomic particles found in the atom

### Name: Block: Date: NNHS Introductory Physics: MCAS Review Packet #4 Introductory Physics, High School Learning Standards for a Full First-Year Course

Introductory Physics, High School Learning Standards for a Full First-Year Course I. C ONTENT S TANDARDS electricity and magnetism. 5.1 Recognize that an electric charge tends to be static on insulators

### Electricity Review completed.notebook. June 13, 2013

Which particle in an atom has no electric charge associated with it? a. proton c. neutron b. electron d. nucleus Jun 12 9:28 PM The electrons in a metal sphere can be made to move by touching it with a