Chapter 4. Chapter 4


 Sharyl Walton
 9 months ago
 Views:
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 kilowatthour (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 Amperehour 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 Amperehour 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 Kilowatthour (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. kilowatthour c. both of the above d. none of the above
20 1. A unit of power is the a. joule b. kilowatthour 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. kilowatthour
22 2. The SI unit of energy is the a. volt b. joule c. watt d. kilowatthour
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.
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
More informationNama :.. Kelas/No Absen :
Nama :.. Kelas/No Absen : TASK 2 : CURRENT AND RESISTANCE 1. A car battery is rated at 80 A h. An amperehour is a unit of: A. power B. energy C. current D. charge E. force 2. Current has units: A. kilowatthour
More informationElectric 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
More informationChapter 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
More informationChapter 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
More informationPhysics 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
More informationDownloaded from
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
More informationQuestion 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.
More informationphysics 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
More informationElectron 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
More informationExercise 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
More information!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,
More informationand 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
More informationChapter 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
More informationELEC 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
More informationPhysics 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
More informationChapter 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
More informationRenewable Energy Systems
Renewable Energy Systems 2 Buchla, Kissell, Floyd Chapter Outline Electrical Fundamentals 2 Buchla, Kissell, Floyd 21 ENERGY, CHARGE, AND VOLTAGE 22 ELECTRICAL CURRENT 23 RESISTANCE AND OHM'S LAW 24
More informationPhysics 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
More informationRESISTANCE 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
More informationPOE Practice Test  Electricity, Power, & Energy
Class: Date: POE Practice Test  Electricity, Power, & Energy Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which of the following forms of energy is
More informationLecture #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
More informationANSWERS AND MARK SCHEMES. (a) (i) 0.4 A 1. (ii) 0.4 A 1. (b) (i) potential difference = current resistance V 1. (ii) 1.6 V 1
QUESTIONSHEET 1 (a) (i) 0.4 A 1 (ii) 0.4 A 1 (b) (i) potential difference = current resistance 1 2.4 V 1 (ii) 1.6 V 1 (c) showing all working 1 correct answer with units for total resistance: 16 Ω 1 calculate
More information10 N acts on a charge in an electric field of strength 250 N.C What is the value of the charge?
Year 11 Physics Electrical Energy in the Home Name: 1. Draw the electric field lines around a) a single positive charge b) between two opposite charged bodies c) two parallel plates + + + + + + +   
More informationIntroduction to Electrical and Computer Engineering. International System of Units (SI)
Introduction to Electrical and Computer Engineering Basic Circuits and Simulation Basic Circuits and Simulation (1 of 22) International System of Units (SI) Length: meter (m) Mass: kilogram (kg) Time:
More informationNational 5 Physics. Electricity and Energy. Notes
National 5 Physics Electricity and Energy Notes Name. 1 P a g e Key Area Notes, Examples and Questions Page 3 Conservation of energy Page 10 Electrical charge carriers and electric fields and potential
More informationEXP. NO. 3 Power on (resistive inductive & capacitive) load Series connection
OBJECT: To examine the power distribution on (R, L, C) series circuit. APPARATUS 1signal function generator 2 Oscilloscope, A.V.O meter 3 Resisters & inductor &capacitor THEORY the following form for
More informationLearning Module 2: Fundamentals of Electricity. 101 Basic Series
Learning Module 2: Fundamentals of Electricity 101 Basic Series What You Will Learn We will start with an overview to introduce you to the main points about electricity, then we will step through each
More informationUnit 2 Electrical Quantities and Ohm s Law
Electrical Quantities and Ohm s Law Objectives: Define a coulomb. Define an ampere. Define a volt. Define an ohm. Define a watt. Objectives: Compute electrical values using Ohm s law. Discuss basic types
More informationTactics Box 23.1 Using Kirchhoff's Loop Law
PH203 Chapter 23 solutions Tactics Box 231 Using Kirchhoff's Loop Law Description: Knight/Jones/Field Tactics Box 231 Using Kirchhoff s loop law is illustrated Learning Goal: To practice Tactics Box 231
More informationEE301 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
More information7.1 ANALYSING ELECTRIC FIELDS AND CHARGE FLOW
7.1 ANALYSING ELECTRIC FIELDS AND CHARGE FLOW State the relationship between electron and electric current Where does charge come from? Matter is made up of tiny particles called atoms. At the center of
More informationElectricity Simplified
Electricity Simplified 0 people liked this 0 discussions READING ASSIGNMENT Electrical Circuits An electrical circuit is defined as a complete electrical path. A typical circuit includes four components:
More informationBasic Electrical Circuits Analysis ECE 221
Basic Electrical Circuits Analysis ECE 221 PhD. Khodr Saaifan http://trsys.faculty.jacobsuniversity.de k.saaifan@jacobsuniversity.de 1 2 Reference: Electric Circuits, 8th Edition James W. Nilsson, and
More informationConceptual Physics. Luis A. Anchordoqui. Department of Physics and Astronomy Lehman College, City University of New York. Lesson V September 26, 2017
Conceptual Physics Luis A. Anchordoqui Department of Physics and Astronomy Lehman College, City University of New York Lesson V September 26, 2017 https://arxiv.org/abs/1711.07445 L. A. Anchordoqui (CUNY)
More informationElectric Currents & Resistance
Electric Currents & Resistance Electric Battery A battery produces electricity by transforming chemical energy into electrical energy. The simplest battery contains two plates or rods made of dissimilar
More informationET 162 Circuit Analysis. Current and Voltage. Electrical and Telecommunication Engineering Technology. Professor Jang
ET 162 Circuit Analysis Current and Voltage Electrical and Telecommunication Engineering Technology Professor Jang Acknowledgement I want to express my gratitude to Prentice Hall giving me the permission
More informationChapter 21 Electric Current and Direct Current Circuits
Chapter 21 Electric Current and Direct Current Circuits Units of Chapter 21 Electric Current Resistance and Ohm s Law Energy and Power in Electric Circuits Resistors in Series and Parallel Kirchhoff s
More informationDirect Current (DC) Circuits
Direct Current (DC) Circuits NOTE: There are short answer analysis questions in the Participation section the informal lab report. emember to include these answers in your lab notebook as they will be
More informationChapter 20 Electric Circuits
Chapter 0 Electric Circuits Chevy olt  Electric vehicle of the future Goals for Chapter 9 To understand the concept of current. To study resistance and Ohm s Law. To observe examples of electromotive
More informationMan Struck By Lightning: Faces Battery Charge. Electricity
Man Struck By Lightning: Faces Battery Charge Electricity Properties of Electric Charge (Elektrisk ladning) Electric charges (q) repel or attract each other Like charges repel Opposite charges attract
More informationCircuit Calculations practice questions
Circuit Calculations practice questions Name  57 minutes 57 marks Page of 8 Q. A battery of emf 9.0 V and internal resistance, r, is connected in the circuit shown in the figure below. (a) The current
More informationBFF1303: 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
More informationPractice Exam 1. Necessary Constants and Equations: Electric force (Coulomb s Law): Electric field due to a point charge:
Practice Exam 1 Necessary Constants and Equations: Electric force (Coulomb s Law): Electric field due to a point charge: Electric potential due to a point charge: Electric potential energy: Capacitor energy:
More information2/25/2014. Circuits. Properties of a Current. Conservation of Current. Definition of a Current A. I A > I B > I C B. I B > I A C. I C D. I A E.
Circuits Topics: Current Conservation of current Batteries Resistance and resistivity Simple circuits 0.1 Electromotive Force and Current Conventional current is the hypothetical flow of positive charges
More informationV R I = UNIT V: Electricity and Magnetism Chapters Chapter 34: Electric Current. volt ohm. voltage. current = I. The Flow of Charge (34.
IMPORTANT TERMS: Alternating current (AC) Ampere Diode Direct current (DC) Electric current Electric power Electric resistance Ohm Ohm s Law Potential difference Voltage source EQUATIONS: UNIT V: Electricity
More informationLecture PowerPoints. Chapter 18 Physics: Principles with Applications, 6 th edition Giancoli
Lecture PowerPoints Chapter 18 Physics: Principles with Applications, 6 th edition Giancoli 2005 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for
More informationSECTION 3 BASIC AUTOMATIC CONTROLS UNIT 12 BASIC ELECTRICITY AND MAGNETISM
SECTION 3 BASIC AUTOMATIC CONTROLS UNIT 12 BASIC ELECTRICITY AND MAGNETISM Unit Objectives Describe the structure of an atom. Identify atoms with a positive charge and atoms with a negative charge. Explain
More informationDC Circuits: Basic Concepts Dr. Hasan Demirel
DC Circuits: Basic Concepts Dr. Hasan Demirel An electric circuit is an interconnection of electrical elements. A simple electric circuit Electric circuit of a radio receiver Six basic SI units and one
More informationCHAPTER INTRODUCTION TO ELECTRIC CIRCUITS. C h a p t e r INTRODUCTION
C h a p t e r CHAPTE NTODUCTON TO ELECTC CCUTS.0 NTODUCTON This chapter is explaining about the basic principle of electric circuits and its connections. The learning outcome for this chapter are the students
More informationElectric Currents and Circuits
Electric Currents and Circuits Producing Electric Current Electric Current flow of charged particles Need a potential difference to occur Conventional Current flow of positive charges flowing from positive
More informationLesson Plan: Electric Circuits (~130 minutes) Concepts
Lesson Plan: Electric Circuits (~130 minutes) Concepts 1. Electricity is the flow of electric charge (electrons). 2. Electric Charge is a property of subatomic particles. 3. Current is the movement of
More informationTOPIC 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.
More informationhttps://www.youtube.com/watch?v=yc2363miqs
https://www.youtube.com/watch?v=yc2363miqs SCIENCE 9 UNIT 3 ELECTRICITY Remember: In the last unit we learned that all matter is made up of atoms atoms have subatomic particles called, protons, neutrons
More informationExperiment #6. Thevenin Equivalent Circuits and Power Transfer
Experiment #6 Thevenin Equivalent Circuits and Power Transfer Objective: In this lab you will confirm the equivalence between a complicated resistor circuit and its Thevenin equivalent. You will also learn
More informationFundamentals of Electric Circuits, Second Edition  Alexander/Sadiku
Chapter 3, Problem 9(8). Find V x in the network shown in Fig. 3.78. Figure 3.78 Chapter 3, Solution 9(8). Consider the circuit below. 2 Ω 2 Ω j 8 30 o I j 4 j 4 I 2 j2v For loop, 8 30 = (2 j4)i ji 2
More informationExperiment Aim: Students will describe the magnitude of resistance and define the EMF (electromotive force) of a cell.
Experiment I: Electromotive force and internal resistance Experiment Aim: Students will describe the magnitude of resistance and define the EMF (electromotive force) of a cell. Experimental tools and materials:
More information8 TH GRADE MATHEMATICS:
8 TH GRADE MATHEMATICS: AIM: USING OHM S LAW TO SOLVE MATH PROBLEMS HOME WORK: HANDOUT BY MR. AKOMAH ENCHANCING STUDENTS SKILLS IN INVERESE OPERATION USING OHMS LAW : Students will 1.Become aware of Ohm's
More informationChapter 7 DirectCurrent Circuits
Chapter 7 DirectCurrent Circuits 7. Introduction... 7. Electromotive Force... 7.3 Resistors in Series and in Parallel... 4 7.4 Kirchhoff s Circuit Rules... 6 7.5 VoltageCurrent Measurements... 8 7.6
More informationIntroductory Circuit Analysis
Introductory Circuit Analysis CHAPTER 6 Parallel dc Circuits OBJECTIVES Become familiar with the characteristics of a parallel network and how to solve for the voltage, current, and power to each element.
More information4.2 Graphs of Rational Functions
4.2. Graphs of Rational Functions www.ck12.org 4.2 Graphs of Rational Functions Learning Objectives Compare graphs of inverse variation equations. Graph rational functions. Solve realworld problems using
More informationCapacitance, Resistance, DC Circuits
This test covers capacitance, electrical current, resistance, emf, electrical power, Ohm s Law, Kirchhoff s Rules, and RC Circuits, with some problems requiring a knowledge of basic calculus. Part I. Multiple
More informationAnalysis of a singleloop circuit using the KVL method
Analysis of a singleloop circuit using the KVL method Figure 1 is our circuit to analyze. We shall attempt to determine the current through each element, the voltage across each element, and the power
More informationElectrical Engineering Fundamentals for NonElectrical Engineers
Electrical Engineering Fundamentals for NonElectrical Engineers by Brad Meyer, PE Contents Introduction... 3 Definitions... 3 Power Sources... 4 Series vs. Parallel... 9 Current Behavior at a Node...
More informationElectric Current, Resistance and Resistivity. Brief otes
Electric current, resistance and restivity Electric Current, esistance and esistivity In This small ebook we will learn all we need to know about current electricity but in short and then we ll have some
More informationFigure 1. In the following information, you will study these three physical quantities as they relate to simple electrical circuits.
Module 7 Ohm s Law INTRODUCTION In this experiment, you will study Ohm s Law, the most fundamental relation used in the analysis of electrical circuits. Ohm s Law relates the quantities of voltage, electric
More informationCAPACITORS / ENERGY STORED BY CAPACITORS / CHARGING AND DISCHARGING
PHYSICS A2 UNIT 4 SECTION 3: CAPACITANCE CAPACITORS / ENERGY STORED BY CAPACITORS / CHARGING AND DISCHARGING # Question CAPACITORS 1 What is current? Current is the rate of flow of charge in a circuit
More informationChapter 5. Department of Mechanical Engineering
Source Transformation By KVL: V s =ir s + v By KCL: i s =i + v/r p is=v s /R s R s =R p V s /R s =i + v/r s i s =i + v/r p Two circuits have the same terminal voltage and current Source Transformation
More informationVersion 001 CIRCUITS holland (1290) 1
Version CIRCUITS holland (9) This printout should have questions Multiplechoice questions may continue on the next column or page find all choices before answering AP M 99 MC points The power dissipated
More informationChapters 24/25: Current, Circuits & Ohm s law Thursday September 29 th **Register your iclickers**
Chapters 24/25: Current, Circuits & Ohm s law Thursday September 29 th **Register your iclickers** Conductors under dynamic conditions Current, current density, drift velocity Ohm s law Types of conductor
More informationPhysics 2220 Fall 2010 George Williams SECOND MIDTERM  REVIEW PROBLEMS
Physics 0 Fall 010 George Williams SECOND MIDTERM  REVIEW PROBLEMS The last four problems are from last years second midterm. Solutions are available on the class web site.. There are no solutions for,
More information14  CURRENT ELECTRICITY Page 1 ( Answers at the end of all questions )
14  CURRENT ELECTRICITY Page 1 1 ) In the circuit, the galvanometer G shows zero deflection. If the batteries A and B have negligible internal resistance, the value of the resistor R will be ( a ) 100
More informationChapter 5 Objectives
Chapter 5 Engr228 Circuit Analysis Dr Curtis Nelson Chapter 5 Objectives State and apply the property of linearity State and apply the property of superposition Investigate source transformations Define
More informationChapter 26 & 27. Electric Current and Direct Current Circuits
Chapter 26 & 27 Electric Current and Direct Current Circuits Electric Current and Direct Current Circuits Current and Motion of Charges Resistance and Ohm s Law Energy in Electric Circuits Combination
More informationFundamental 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
More informationUnit 3 BLM Answers UNIT 3 BLM 346
UNIT 3 BLM 346 Unit 3 BLM Answers BLM 33, Charge Transfer Diagrams 1. Positively charged objects should have more (+) than ( ). Negatively charged objects should have more ( ) than (+). 2. They must
More informationExam Practice Problems (5 Point Questions) Photoresistors
Exam Practice Problems (5 Point Questions) Below are practice problems for the fivepoint questions found on the exam. These questions come from past exams as well additional questions created by faculty.
More informationGeneral Physics (PHY 2140)
General Physics (PHY 2140) Lecture 9 Electrodynamics Electric current temperature variation of resistance electrical energy and power http://www.physics.wayne.edu/~apetrov/phy2140/ Chapter 1718 1 Department
More informationChapter 25 Current, Resistance, and Electromotive Force
Chapter 25 Current, Resistance, and Electromotive Force Lecture by Dr. Hebin Li Goals for Chapter 25 To understand current and how charges move in a conductor To understand resistivity and conductivity
More informationThe equation which links current, potential difference and resistance is:
An electrical circuit is shown in the figure below. The current in the circuit is direct current. What is meant by direct current? Tick one box. Current that continuously changes direction. Current that
More informationChapter 1 Circuit Variables
Chapter 1 Circuit Variables 1.1 Electrical Engineering: An Overview 1.2 The International System of Units 1.3 Circuit Analysis: An Overview 1.4 Voltage and Current 1.5 The Ideal Basic Circuit Element 1.6
More informationSPH3U1 Lesson 01 Electricity
ELECTRIC CURRENT AND POTENTIAL DIFFERENCE LEARNING GOALS Students will: Define what is meant by electric current. Solve problems involving current, charge and time. Know the difference between electron
More informationPhysicsAndMathsTutor.com
Electricity May 02 1. The graphs show the variation with potential difference V of the current I for three circuit elements. PhysicsAndMathsTutor.com When the four lamps are connected as shown in diagram
More informationElectronics 101. John Sweeny Saturday September 28 th, 2013 OFF
Electronics 101 NANT New York John Sweeny Saturday September 28 th, 2013 OFF Is this your understanding of a Dialysis Machine? 2 Electricity is intimidating because Human aren t equipped to detect it until
More informationPHY232 Spring 2008 Jon Pumplin (Original ppt courtesy of Remco Zegers) Direct current Circuits
PHY232 Spring 2008 Jon Pumplin http://www.pa.msu.edu/~pumplin/phy232 (Original ppt courtesy of Remco Zegers) Direct current Circuits So far, we have looked at systems with only one resistor PHY232 Spring
More informationCHARGE AND ELECTRIC CURRENT:
ELECTRICITY: CHARGE AND ELECTRIC CURRENT ELECTRIC CHARGE ELECTRIC CURRENT ELECTRIC CIRCUIT DEFINITION AND COMPONENTS EFFECTS OF ELECTRIC CURRENT TYPES OF CIRCUITS ELECTRIC QUANTITIES VOLTAGE CURRENT RESISTANCE
More informationPhysics 2B Winter 2012 Final Exam Practice
Physics 2B Winter 2012 Final Exam Practice 1) When the distance between two charges is increased, the force between the charges A) increases directly with the square of the distance. B) increases directly
More informationEXPERIMENT 2 Ohm s Law
İzmir University of Economics EEE 0 Fundamentals of Electrical Circuits Lab EXPERMENT Ohm s Law A. Background When a voltage over a resistor is applied, there will be a flow of electrons through the resistor,
More informationI. Impedance of an RL circuit.
I. Impedance of an RL circuit. [For inductor in an AC Circuit, see Chapter 31, pg. 1024] Consider the RL circuit shown in Figure: 1. A current i(t) = I cos(ωt) is driven across the circuit using an AC
More informationElectron Theory. Elements of an Atom
Electron Theory Elements of an Atom All matter is composed of molecules which are made up of a combination of atoms. Atoms have a nucleus with electrons orbiting around it. The nucleus is composed of protons
More informationVoltage (AC) period, T
331 (SJP, Phys 1120) AC Voltage and Current: Batteries produce a steady, fixed voltage, called DC, or direct current. (We should probably call them DV, direct voltage, but never mind) The power company
More informationmywbut.com Mesh Analysis
Mesh Analysis 1 Objectives Meaning of circuit analysis; distinguish between the terms mesh and loop. To provide more general and powerful circuit analysis tool based on Kirchhoff s voltage law (KVL) only.
More informationELECTRIC CURRENT. Ions CHAPTER Electrons. ELECTRIC CURRENT and DIRECTCURRENT CIRCUITS
LCTRC CURRNT CHAPTR 25 LCTRC CURRNT and DRCTCURRNT CRCUTS Current as the motion of charges The Ampère Resistance and Ohm s Law Ohmic and nonohmic materials lectrical energy and power ons lectrons nside
More informationHOW VOLTAGE, CURRENT, AND RESISTANCE RELATE
HOW VOLTAGE, CURRENT, AND RESISTANCE RELATE An electric circuit is formed when a conductive path is created to allow free electrons to continuously move. This continuous movement of free electrons through
More informationELECTRICITY & CIRCUITS
ELECTRICITY & CIRCUITS Reason and justice tell me there s more love for humanity in electricity and steam than in chastity and vegetarianism. Anton Chekhov LIGHTNING, PART 2 Electricity is really just
More informationChapter 19: Electrochemistry I. Chem 102 Dr. Eloranta
Chapter 19: Electrochemistry I Chem 102 Dr. Eloranta 2 Electrochemistry The study of the relationships between electrical processes and chemical processes Batteries, electroplating, fuel cells, hydrogen
More informationLab 4 Series and Parallel Resistors
Lab 4 Series and Parallel Resistors What You Need To Know: The Physics Last week you examined how the current and voltage of a resistor are related. This week you are going to examine how the current and
More informationConcepTest Clicker Questions. Chapter 26 Physics: for Scientists & Engineers with Modern Physics, 4th edition Giancoli
ConcepTest Clicker Questions Chapter 26 Physics: for Scientists & Engineers with Modern Physics, 4th edition Giancoli 2008 Pearson Education, Inc. This work is protected by United States copyright laws
More informationElectrical Engineering Technology
Electrical Engineering Technology 1 ECET 17700  DAQ & Control Systems Lecture # 9 Loading, Thévenin Model & Norton Model Professors Robert Herrick & J. Michael Jacob Module 1 Circuit Loading Lecture 9
More informationArduino Software: How long before my battery is dead?, version 2.4
Arduino Software: How long before my battery is dead?, version 2.4 By R. G. Sparber Protected by Creative Commons. 1 When powering an Arduino from a battery, it can be useful to be able to monitor available
More information