# Chapter 4. Chapter 4

Size: px
Start display at page:

Transcription

1 Chapter 4

2 Energy 1 n Energy, W, is the ability to do work and is measured in joules. One joule is the work done when a force of one newton is applied through a distance of one meter. The symbol for energy, W, represents work, but should not be confused with the unit for power, the watt, W. 1 m

3 In general, energy (E) is equivalent to power (P) multiplied by time (t). The kilowatt-hour (kwh) is a unit of energy equivalent to one kilowatt (1 KW) of power expended for one hour (1h) of time. It is a much larger unit of energy than the joule. There are 3.6 x 10 6 J in a kwh. The kwh is convenient for electrical appliances. Energy What is the energy used in operating a 1200 W heater for 20 minutes? 1200 W = 1.2 kw 20 min = 1/3 h 1.2 kw X 1/3 h = 0.4 kwh

4 Power The symbol for Power is P Power is the rate energy is used (actually converted to heat or another form). Power is measured in watts (or kilowatts). Notice that rate always involves time. One watt = one joule/second Three equations for power in circuits that are collectively known as Watt s law are: P IV P I 2 R P V R 2

5 equals horsepower

6

7 Power Formulas There are three basic power formulas, but each can be in three forms for nine combinations. P VI P I 2 R P V R 2 I P V R P I 2 R V P 2 V P I I P R V PR Where: P = Power V = Voltage I = Current R=Resistance

8 Power Formulas Combining Ohm s Law and the Power Formula All nine power formulas are based on Ohm s Law. V = IR I = V R P = VI Substitute IR for V or V/R for I to obtain: * P = VI * P = VI * = (IR)I * = V x V/R * = I 2 R * = V2 / R

9 Applying Power Formulas 5 A P = VI = 20V 5A = 100 W 20 V 4 P = I 2 R = 25A 4Ω = 100 W P = V2 R = 400V 4Ω = 100 W

10 Electric Power To calculate electric cost, start with the power: An air conditioner operates at 240 volts and 20 amperes. The power is P = V I = = 4800 watts. Convert to kilowatts: 4800 watts = 4.8 kilowatts Multiply by hours: (Assume it runs half the day) energy = 4.8 kw 12 hours = 57.6 kwh Multiply by rate: (Assume a rate of \$0.08/ kwh) cost = 57.6 \$0.08 = \$4.61 per day

11 Power Dissipation When current flows in a resistance, heat is produced from the friction between the moving free electrons and the atoms obstructing their path. What power is dissipated in a 27 resistor if the current is A? Given that you know the resistance and current, substitute the values into P =I 2 R. P 2 I R 2 (0.135 A) W Heat is evidence that power is used in producing current.

12 Power Dissipation What power is dissipated by a heater that draws 12 A of current from a 110 V supply? The most direct solution is to substitute into P = IV. P IV 12 A110 V 1320 W

13 Power Dissipation What power is dissipated in a 100 resistor with 5 V across it? 2 V The most direct solution is to substitute into P. 2 R V P R 5 V W It is useful to keep in mind that small resistors operating in low voltage systems need to be sized for the anticipated power.

14 Resistor failures Resistor failures are unusual except when they have been subjected to excessive heat. Look for discoloration (sometimes the color bands appear burned). Test with an ohmmeter by disconnecting one end from the circuit to isolate it and verify the resistance. Correct the cause of the heating problem (larger resistor?, wrong value?). Normal Overheated

15 Ampere-hour Rating of Batteries Expected battery life of batteries is given as the amperehours specification. Various factors affect this, so it is an approximation. (Factors include rate of current withdrawal, age of battery, temperature, etc.) How many hours can you expect to have a battery deliver 0.5 A if it is rated at 10 Ah? Battery 20 h

16 Power Supply Efficiency Efficiency of a power supply is a measure of how well it converts ac to dc. For all power supplies, some of the input power is wasted in the form of heat. As an equation, Efficiency = P P IN OUT Power lost Input power What is the efficiency of a power supply that converts 20 W of input power to 17 W of output power? 85% Output power

17 Ampere-hour rating Efficiency Energy Joule Selected Key Terms A number determined by multiplying the current (A) times the length of time (h) that a battery can deliver that current to a load. The ratio of output power to input power of a circuit, usually expressed as a percent. The ability to do work. The SI unit of energy.

18 Kilowatt-hour (kwh) Power Watt Selected Key Terms A large unit of energy used mainly by utility companies. The rate of energy useage The SI unit of power.

19 1. A unit of power is the a. joule b. kilowatt-hour c. both of the above d. none of the above

20 1. A unit of power is the a. joule b. kilowatt-hour c. both of the above d. none of the above It is the Watt (W)

21 2. The SI unit of energy is the a. volt b. joule c. watt d. kilowatt-hour

22 2. The SI unit of energy is the a. volt b. joule c. watt d. kilowatt-hour

23 3. If the voltage in a resistive circuit is doubled, the power will be a. halved b. unchanged c. doubled d. quadrupled

24 3. If the voltage in a resistive circuit is doubled, the power will be a. halved b. unchanged c. doubled d. quadrupled P E R 2

25 4. The smallest power rating you should use for a resistor that is 330 with 12 V across it is a. ¼ W b. ½ W c. 1 W d. 2 W

26 4. The smallest power rating you should use for a resistor that is 330 with 12 V across it is a. ¼ W b. ½ W c. 1 W (12V ) W d. 2 W

27 5. The power dissipated by a light operating on 12 V that has 3 A of current is a. 4 W b. 12 W c. 36 W d. 48 W

28 5. The power dissipated by a light operating on 12 V that has 3 A of current is a. 4 W b. 12 W c. 36 W d. 48 W ( 12V )(3A)

29 6. The power rating of a resistor is determined mainly by a. surface area b. length c. body color d. applied voltage

30 6. The power rating of a resistor is determined mainly by a. surface area b. length c. body color d. applied voltage

31 7. The circuit with the largest power dissipation is a. (a) b. (b) c. (c) d. (d) +10 V R +15 V R +20 V R +25 V R (a) (b) (c) (d)

32 7. The circuit with the largest power dissipation is a. (a) b. (b) c. (c) d. (d) 2 (25V ) W +10 V R +15 V R +20 V R +25 V R (a) (10V ) (b) (15V ) (c) (20V ) (d) 100 1W W W

33 8. The circuit with the smallest power dissipation is a. (a) b. (b) c. (c) d. (d) +10 V R +15 V R +20 V R +25 V R (a) (b) (c) (d)

34 8. The circuit with the smallest power dissipation is a. (a) b. (b) c. (c) d. (d) 2 (25V ) W +10 V R +15 V R +20 V R +25 V R (a) (10V ) (b) (15V ) (c) (20V ) (d) 100 1W W W

35 9. A battery rated for 20 Ah can supply 2 A for a minimum of a. 0.1 h b. 2 h c. 10 h d. 40 h

36 9. A battery rated for 20 Ah can supply 2 A for a minimum of a. 0.1 h b. 2 h c. 10 h d. 40 h 20Ah 2A

37 10. The efficiency of a power supply is determined by a. Dividing the output power by the input power. b. Dividing the output voltage by the input voltage. c. Dividing the input power by the output power. d. Dividing the input voltage by the output voltage.

38 10. The efficiency of a power supply is determined by a. Dividing the output power by the input power. b. Dividing the output voltage by the input voltage. c. Dividing the input power by the output power. d. Dividing the input voltage by the output voltage.

### Chapter 3. Chapter 3

Chapter 3 Review of V, I, and R Voltage is the amount of energy per charge available to move electrons from one point to another in a circuit and is measured in volts. Current is the rate of charge flow

Chapter 3 Ohm s Law Topics Covered in Chapter 3 3-1: The Current I = V/R 3-2: The Voltage V = IR 3-3: The Resistance R = V/I 3-4: Practical Units 3-5: Multiple and Submultiple Units 2007 The McGraw-Hill

### Current and Resistance

Current and Resistance 1 Define the current. Understand the microscopic description of current. Discuss the rat at which the power transfer to a device in an electric current. 2 2-1 Electric current 2-2

### Chapter 18. Direct Current Circuits

Chapter 18 Direct Current Circuits Sources of emf The source that maintains the current in a closed circuit is called a source of emf Any devices that increase the potential energy of charges circulating

### Circuits-Ohm's Law. 1. Which graph best represents the relationship between the electrical power and the current in a resistor that obeys Ohm s Law?

1. Which graph best represents the relationship between the electrical power and the current in a resistor that obeys Ohm s Law? 2. A potential drop of 50 volts is measured across a 250- ohm resistor.

### and in a simple circuit Part 2

Current, Resistance, and Voltage in a simple circuit Part 2 Electric Current Whenever electric charges of like signs move, an electric current is said to exist. Look at the charges flowing perpendicularly

### ELECTRICITY. Prepared by: M. S. KumarSwamy, TGT(Maths) Page

ELECTRICITY 1. Name a device that helps to maintain a potential difference across a conductor. Cell or battery 2. Define 1 volt. Express it in terms of SI unit of work and charge calculate the amount of

### 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

### 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

### 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

### Trade of Electrician. Power and Energy

Trade of Electrician Standards Based Apprenticeship Power and Energy Phase 2 Module No. 2.1 Unit No. 2.1.6 COURSE NOTES SOLAS Electrical Course Notes - Unit 2.1.6 Created by Gerry Ryan - Galway TC Revision

### Nama :.. Kelas/No Absen :

Nama :.. Kelas/No Absen : TASK 2 : CURRENT AND RESISTANCE 1. A car battery is rated at 80 A h. An ampere-hour is a unit of: A. power B. energy C. current D. charge E. force 2. Current has units: A. kilowatt-hour

### 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

### 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

### Electric Current. Chapter 17. Electric Current, cont QUICK QUIZ Current and Resistance. Sections: 1, 3, 4, 6, 7, 9

Electric Current Chapter 17 Current and Resistance Sections: 1, 3, 4, 6, 7, 9 Whenever electric charges of like signs move, an electric current is said to exist The current is the rate at which the charge

### Closed loop of moving charges (electrons move - flow of negative charges; positive ions move - flow of positive charges. Nucleus not moving)

Unit 2: Electricity and Magnetism Lesson 3: Simple Circuits Electric circuits transfer energy. Electrical energy is converted into light, heat, sound, mechanical work, etc. The byproduct of any circuit

### Current Electricity.notebook. December 17, 2012

1 Circuit Diagrams and Assembly 1. Draw a circuit diagram containing a battery, a single throw switch, and a light. 2. Once the diagram has been checked by your teacher, assemble the circuit. Keep the

### Physics 7B-1 (A/B) Professor Cebra. Winter 2010 Lecture 2. Simple Circuits. Slide 1 of 20

Physics 7B-1 (A/B) Professor Cebra Winter 2010 Lecture 2 Simple Circuits Slide 1 of 20 Conservation of Energy Density In the First lecture, we started with energy conservation. We divided by volume (making

### Information for Makeup exam is posted on the course website.

Information for Makeup exam is posted on the course website. Three resistors are connected to a 6-V battery as shown. The internal resistance of the battery is negligible. What is the current through the

### 1 of 23. Boardworks Ltd Electrical Power

1 of 23 Boardworks Ltd 2016 Electrical Power Electrical Power 2 of 23 Boardworks Ltd 2016 What is electrical power? 3 of 23 Boardworks Ltd 2016 Electrical power is the rate at which energy is transferred

### Electricity. dronstudy.com

Electricity Electricity is a basic part of our nature and it is one of our most widely used forms of energy. We use electricity virtually every minute of every day for example in lighting, heating, refrigeration,

### Chapter 17 Electric Current and Resistance Pearson Education, Inc.c

Chapter 17 Electric Current and Resistance 2010 Pearson Education, Inc.c 1 Units of Chapter 17 Batteries and Direct Current Current and Drift Velocity Resistance and Ohm s Law Electric Power 2010 Pearson

### Electricity Final Unit Final Assessment

Electricity Final Unit Final Assessment Name k = 1/ (4pe 0 ) = 9.0 10 9 N m 2 C -2 mass of an electron = 9.11 10-31 kg mass of a proton = 1.67 10-27 kg G = 6.67 10-11 N m 2 kg -2 C = 3 x10 8 m/s Show all

### Chapter 17. Current and Resistance. Sections: 1, 3, 4, 6, 7, 9

Chapter 17 Current and Resistance Sections: 1, 3, 4, 6, 7, 9 Equations: 2 2 1 e r q q F = k 2 e o r Q k q F E = = I R V = A L R ρ = )] ( 1 [ o o T T + = α ρ ρ V I V t Q P = = R V R I P 2 2 ) ( = = C Q

### This week. 3/23/2017 Physics 214 Summer

This week Electrical Circuits Series or parallel that s the question. Current, Power and Energy Why does my laptop battery die? Transmission of power to your home Why do we have big transmission towers?

### This week. 6/2/2015 Physics 214 Summer

This week Electrical Circuits Series or parallel that s the question. Current, Power and Energy Why does my laptop battery die? Transmission of power to your home Why do we have big transmission towers?

### Chapter 21 Electric Current and Circuits

Chapter 21 Electric Current and Circuits 1 As an introduction to this chapter you should view the following movie. If you cannot click on the link, then copy it and paste it into your web browser. http://www.ionaphysics.org/movies/vir.mp4

### Electrical equations calculations

Task Use the following equations to answer the questions. You may need to rearrange the equations and convert the units. An example has been done for you. P = I x V V = I x R P = I 2 x R E = P x t E =

### CLASS X- ELECTRICITY

Conductor- Insulator: Materia Materials through which electric current cannot pass are called insulators. Electric Circuit: A continuous a CLASS X- ELECTRICITY als through which electric current can pass

### Chapter 25 Electric Currents and. Copyright 2009 Pearson Education, Inc.

Chapter 25 Electric Currents and Resistance 25-1 The Electric Battery Volta discovered that electricity could be created if dissimilar metals were connected by a conductive solution called an electrolyte.

### PHYSICS 171. Experiment 3. Kirchhoff's Laws. Three resistors (Nominally: 1 Kilohm, 2 Kilohm, 3 Kilohm).

PHYSICS 171 Experiment 3 Kirchhoff's Laws Equipment: Supplies: Digital Multimeter, Power Supply (0-20 V.). Three resistors (Nominally: 1 Kilohm, 2 Kilohm, 3 Kilohm). A. Kirchhoff's Loop Law Suppose that

### Coulomb s constant k = 9x10 9 N m 2 /C 2

1 Part 2: Electric Potential 2.1: Potential (Voltage) & Potential Energy q 2 Potential Energy of Point Charges Symbol U mks units [Joules = J] q 1 r Two point charges share an electric potential energy

### Chapter 33 - Electric Fields and Potential. Chapter 34 - Electric Current

Chapter 33 - Electric Fields and Potential Chapter 34 - Electric Current Electric Force acts through a field An electric field surrounds every electric charge. It exerts a force that causes electric charges

### ELECTRICITY. Electric Circuit. What do you already know about it? Do Smarty Demo 5/30/2010. Electric Current. Voltage? Resistance? Current?

ELECTRICITY What do you already know about it? Voltage? Resistance? Current? Do Smarty Demo 1 Electric Circuit A path over which electrons travel, out through the negative terminal, through the conductor,

### EXPERIMENT 12 OHM S LAW

EXPERIMENT 12 OHM S LAW INTRODUCTION: We will study electricity as a flow of electric charge, sometimes making analogies to the flow of water through a pipe. In order for electric charge to flow a complete

### 670 Intro Physics Notes: Electric Current and Circuits

Name: Electric Current Date: / / 670 Intro Physics Notes: Electric Current and Circuits 1. Previously, we learned about static electricity. Static electricity deals with charges that are at rest. 2. Now

### Equivalent resistance in Series Combination

Combination of Resistances There are two methods of joining the resistors together. SERIES CONNECTION An electric circuit in which three resistors having resistances R1, R2 and R3, respectively, are joined

### 8. Electric circuit: The closed path along which electric current flows is called an electric circuit.

GIST OF THE LESSON 1. Positive and negative charges: The charge acquired by a glass rod when rubbed with silk is called positive charge and the charge acquired by an ebonite rod when rubbed with wool is

### Chapter 19. Electric Current, Resistance, and DC Circuit Analysis

Chapter 19 Electric Current, Resistance, and DC Circuit Analysis I = dq/dt Current is charge per time SI Units: Coulombs/Second = Amps Direction of Electron Flow _ + Direction of Conventional Current:

### (b) State the relation between work, charge and potential difference for an electric circuit.

Question Bank on Ch-Electricity 1. (a) Define the S.I unit of potential difference. (b) State the relation between work, charge and potential difference for an electric circuit. Calculate the potential

### ELECTRIC CIRCUITS. Checklist. Exam Questions

ELECTRIC CIRCUITS Checklist Make sure you can. State Ohm's law in words. Determine relationship between current, potential difference and resistance at constant temperature using a simple circuit Draw,

Forces Read Chapter 7; pages: 191-221 Objectives: - Describe how electrical charges exert forces on each other; Compare the strengths of electric and gravitational forces; Distinguish between conductors

### STUDY GUIDE CHAPTER 5 ELECTRICITY AND MAGNETISM 1) ASSOCIATE ELEMENTARY PARTICLES WITH THEIR ELECTRICAL CHARGE

Name Date STUDY GUIDE CHAPTER 5 ELECTRICITY AND MAGNETISM 1) ASSOCIATE ELEMENTARY PARTICLES WITH THEIR ELECTRICAL CHARGE Scientists now know that an atom is composed of even smaller particles of matter:

### Chapter 25 Electric Currents and Resistance. Copyright 2009 Pearson Education, Inc.

Chapter 25 Electric Currents and Resistance 25-4 Resistivity Example 25-5: Speaker wires. Suppose you want to connect your stereo to remote speakers. (a) If each wire must be 20 m long, what diameter copper

### Physics 214 Spring

Lecture 23 March 4 2016 The elation between Voltage Differences V and Voltages V? Current Flow, Voltage Drop on esistors and Equivalent esistance Case 1: Series esistor Combination and esulting Currents

### 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

### Notes: Ohm s Law and Electric Power

Name: Date: / / 644 Intro Physics Notes: Ohm s Law and Electric Power Ohm s Law: Important Terms Term Symbol Units Definition 1. current I amps flow of electric charges through a conductor 2. voltage V

### Electric current is a flow of electrons in a conductor. The SI unit of electric current is ampere.

C h a p t e r at G l a n c e 4. Electric Current : Electric current is a flow of electrons in a conductor. The SI unit of electric current is ampere. Current = Charge time i.e, I = Q t The SI unit of charge

### Section 1: Electric Charge and Force

Electricity Section 1 Section 1: Electric Charge and Force Preview Key Ideas Bellringer Electric Charge Transfer of Electric Charge Induced Charges Charging by Contact Electric Force Electric Field Lines

CHAPTER 12 ELECTRICITY Electricity is a general term that encompasses a variety of phenomena resulting from the presence and flow of electric charge. These include many easily recognizable phenomena such

### Q-2 How many coulombs of charge leave the power supply during each second?

Part I - Circuit Elements in Series In Figure 1 at the right circuit elements #1, #2, #3 (in this case light bulbs) are said to be connected "IN SERIES". That is, they are connected in a series one right

### Chapter 2. Engr228 Circuit Analysis. Dr Curtis Nelson

Chapter 2 Engr228 Circuit Analysis Dr Curtis Nelson Chapter 2 Objectives Understand symbols and behavior of the following circuit elements: Independent voltage and current sources; Dependent voltage and

### physics 4/7/2016 Chapter 31 Lecture Chapter 31 Fundamentals of Circuits Chapter 31 Preview a strategic approach THIRD EDITION

Chapter 31 Lecture physics FOR SCIENTISTS AND ENGINEERS a strategic approach THIRD EDITION randall d. knight Chapter 31 Fundamentals of Circuits Chapter Goal: To understand the fundamental physical principles

### Electrodynamics. Review 8

Unit 8 eview: Electrodynamics eview 8 Electrodynamics 1. A 9.0 V battery is connected to a lightbulb which has a current of 0.5 A flowing through it. a. How much power is delivered to the b. How much energy

### 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

### Exercise 2: The DC Ohmmeter

Exercise 2: The DC Ohmmeter EXERCISE OBJECTIVE When you have completed this exercise, you will be able to measure resistance by using a basic meter movement. You will verify ohmmeter operation by measuring

### Which of these particles has an electrical charge?

Which of these particles has an electrical charge? A. Proton. B. Electron. C. Ion. D. All of the above. Which is the predominant carrier of charge in copper wire? A. Proton. B. Electron. C. Ion. D. All

### CHAPTER 20 ELECTRIC CIRCUITS

CHAPTER 20 ELECTRIC CIRCUITS PROBLEMS. SSM REASONING Since current is defined as charge per unit time, the current used by the portable compact disc player is equal to the charge provided by the battery

### ELECTRICITY UNIT REVIEW

ELECTRICITY UNIT REVIEW S1-3-04: How does the Atomic Model help to explain static electricity? 1. Which best describes static electricity? a) charges that can be collected and held in one place b) charges

### Electricity CHAPTER ELECTRIC CURRENT AND CIRCUIT

CHAPTER 12 Electricity Electricity has an important place in modern society. It is a controllable and convenient form of energy for a variety of uses in homes, schools, hospitals, industries and so on.

### 1. Which of the following appliances makes use of the heating effect of electricity?

Name: ( ) Class: Date: ASSIGNMENT Chapter 15: Practical Electricity 25 Multiple-Choice Questions (10 marks) 1. Which of the following appliances makes use of the heating effect of electricity? A Electric

### 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

### Ohms Law. V = IR V = voltage in volts (aka potential difference) I = Current in amps R = resistance in ohms (Ω)

Ohms Law V = IR V = voltage in volts (aka potential difference) I = Current in amps R = resistance in ohms (Ω) Current How would you define it? Current the movement of electric charge through a medium

### Class 8. Resistivity and Resistance Circuits. Physics 106. Winter Press CTRL-L to view as a slide show. Class 8. Physics 106.

and Circuits and Winter 2018 Press CTRL-L to view as a slide show. Last time we learned about Capacitance Problems Parallel-Plate Capacitors Capacitors in Circuits Current Ohm s Law and Today we will learn

### Electricity Test Review

Electricity Test Review Definitions; Series Circuit, Parallel Circuit, Equivalent Resistance, Fuse, Circuit Breaker, kilowatt hour, load, short circuit, dry cell, wet cell, fuel cells, solar cells, fossil

### RECALL?? Electricity concepts in Grade 9. Sources of electrical energy Current Voltage Resistance Power Circuits : Series and Parallel

Unit 3C Circuits RECALL?? Electricity concepts in Grade 9. Sources of electrical energy Current Voltage Resistance Power Circuits : Series and Parallel 2 Types of Electricity Electrostatics Electricity

### Greek Letter Omega Ω = Ohm (Volts per Ampere)

) What is electric current? Flow of Electric Charge 2) What is the unit we use for electric current? Amperes (Coulombs per Second) 3) What is electrical resistance? Resistance to Electric Current 4) What

### Use these circuit diagrams to answer question 1. A B C

II Circuit Basics Use these circuit diagrams to answer question 1. B C 1a. One of the four voltmeters will read 0. Put a checkmark beside it. b. One of the ammeters is improperly connected. Put a checkmark

### meas (1) calc calc I meas 100% (2) Diff I meas

Lab Experiment No. Ohm s Law I. Introduction In this lab exercise, you will learn how to connect the to network elements, how to generate a VI plot, the verification of Ohm s law, and the calculation of

### 15 - THERMAL AND CHEMICAL EFFECTS OF CURRENTS Page 1 ( Answers at the end of all questions )

5 - THERMAL AND CHEMICAL EFFECTS OF CURRENTS Page A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be four times doubled halved ( d one-fourth

### ELEC 103. Objectives

ELEC 103 Voltage, Current, and Resistance Objectives Define voltage and discuss its characteristics Define current and discuss its characteristics Define resistance and discuss its characteristics Identify

Science Olympiad Circuit Lab Key Concepts Circuit Lab Overview Circuit Elements & Tools Basic Relationships (I, V, R, P) Resistor Network Configurations (Series & Parallel) Kirchhoff s Laws Examples Glossary

### Chapter 25 Electric Currents and Resistance. Copyright 2009 Pearson Education, Inc.

Chapter 25 Electric Currents and Resistance Units of Chapter 25 The Electric Battery Electric Current Ohm s Law: Resistance and Resistors Resistivity Electric Power Units of Chapter 25 Power in Household

### I ve got the. power! Power and Percent Efficiency. Wednesday April 16, Wednesday, April 16, 14

I ve got the power! Power and Percent Efficiency Wednesday April 16, 2014. Power? WATT s that? Power is defined as energy per unit of time Electrical power describes the amount of electrical energy that

### Physics Module Form 5 Chapter 2- Electricity GCKL 2011 CHARGE AND ELECTRIC CURRENT

2.1 CHARGE AND ELECTRIC CURRENT Van de Graaf 1. What is a Van de Graaff generator? Fill in each of the boxes the name of the part shown. A device that produces and store electric charges at high voltage

### Question Bank. Electric Energy, Power and Household Circuits

Electric Energy, Power and Household Circuits 1. (a) What do you understand by the term electric work? (b) State the SI unit of electric work and define it. (c) Name two bigger units of electric work.

### RESISTANCE AND NETWORKS

PURPOSE The purpose of this laboratory is to learn to construct simple circuits; and, to become familiar with the use of power supplies and the digital multimeter. to experimentally find the equivalent

### Capacitance. A different kind of capacitor: Work must be done to charge a capacitor. Capacitors in circuits. Capacitor connected to a battery

Capacitance The ratio C = Q/V is a conductor s self capacitance Units of capacitance: Coulomb/Volt = Farad A capacitor is made of two conductors with equal but opposite charge Capacitance depends on shape

### Physics 102: Lecture 05 Circuits and Ohm s Law

Physics 102: Lecture 05 Circuits and Ohm s Law Physics 102: Lecture 5, Slide 1 Summary of Last Time Capacitors Physical C = ke 0 A/d C=Q/V Series 1/C eq = 1/C 1 + 1/C 2 Parallel C eq = C 1 + C 2 Energy

### and the charge on a proton is +e. We never see objects that have a charge which is not a whole number multiple of this number.

Name: Physics Chapter 17 Study Guide ----------------------------------------------------------------------------------------------------- Useful Information: e = 1.6"10 #19 C k = 9 "10 9 Nm 2 C 2 \$ 0

### 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

### 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

### DC Circuits. Circuits and Capacitance Worksheet. 10 Ω resistance. second? on the sodium is the same as on an electron, but positive.

Circuits and Capacitance Worksheet DC Circuits 1. A current of 1.30 A flows in a wire. How many electrons are flowing past any point in the wire per second? 2. What is the current in amperes if 1200 Na

### 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,

### !E = (60.0 W)( s) = 6.48 " 10 5 Wi s!e = 6.48 " 10 5 J (one extra digit carried)

Chapter Review, pages 40 4 Knowledge. (b). (b) 3. (c) 4. (d). (b) 6. (c) 7. (a) 8. (d) 9. (c) 0. True. False. Carbon capture and storage is a technology that captures carbon dioxide leaving the smokestack,

### Protons = Charge Electrons = Charge Neutrons = Charge. When Protons = Electrons, atoms are said to be ELECTRICALLY NEUTRAL (no net charge)

QUICK WRITE: For 2 minutes, write the three parts of an atom and what their charges are. Explain what creates an electric charge (positive or negative) on something. Rules - You MUST write for the entire

### Lecture #3. Review: Power

Lecture #3 OUTLINE Power calculations Circuit elements Voltage and current sources Electrical resistance (Ohm s law) Kirchhoff s laws Reading Chapter 2 Lecture 3, Slide 1 Review: Power If an element is

### Electromagnetism Checklist

Electromagnetism Checklist Elementary Charge and Conservation of Charge 4.1.1A Convert from elementary charge to charge in coulombs What is the charge in coulombs on an object with an elementary charge

### Electric Circuits. June 12, 2013

Electric Circuits June 12, 2013 Definitions Coulomb is the SI unit for an electric charge. The symbol is "C". Electric Current ( I ) is the flow of electrons per unit time. It is measured in coulombs per

### Physics Module Form 5 Chapter 2- Electricity GCKL 2011 CHARGE AND ELECTRIC CURRENT

2.1 CHARGE AND ELECTRIC CURRENT Van de Graaf 1. What is a Van de Graaff generator? Fill in each of the boxes the name of the part shown. A device that... and... at high voltage on its dome. dome 2. You

### Chapter 18 Electric Currents

Chapter 18 Electric Currents 1 The Electric Battery Volta discovered that electricity could be created if dissimilar metals were connected by a conductive solution called an electrolyte. This is a simple

### 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

### EE301 RESISTANCE AND OHM S LAW

Learning Objectives a. Describe the concept of resistance b. Use Ohm s law to calculate current, voltage, and resistance values in a circuit c. Discuss the difference between an open circuit and a short

### 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

### US ARMY INTELLIGENCE CENTER CIRCUITS

SUBCOURSE IT 0334 EDITION C US ARMY INTELLIGENCE CENTER CIRCUITS CIRCUITS Subcourse Number IT0334 EDITION C US ARMY INTELLIGENCE CENTER FORT HUACHUCA, AZ 85613-6000 4 Credit Hours Edition Date: December

### Electricity Worksheet (p.1) All questions should be answered on your own paper.

Electricity Worksheet (p.1) 1. In terms of attraction and repulsion, how do negative particles affect negative particles? How do negatives affect positives? 2. What happens to electrons in any charging

### 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.

### Lecture (07) Electric Current and Resistance By: Dr. Ahmed ElShafee Dr. Ahmed ElShafee, ACU : Spring 2015, Physics II

Lecture (07) Electric Current and Resistance By: Dr. Ahmed ElShafee ١ The glow of the thin wire filament of a light bulb is caused by the electric current passing through it. Electric energy is transformed