Chapter 26 Direct-Current Circuits
|
|
- Irma Myrtle Allison
- 5 years ago
- Views:
Transcription
1 Chapter 26 Direct-Current Circuits 1 Resistors in Series and Parallel In this chapter we introduce the reduction of resistor networks into an equivalent resistor R eq. We also develop a method for analyzing more complicated circuit networks by using Kirchhoff s rules. In both these cases, the goal is to find the current between junctions in the circuits. Afterwards we will investigate the varying current that occurs in circuits containing both resistors and capacitors. Finally, we will take a brief look at power distribution systems. 1.1 Resistors in Series Figure 1: This figure shows three resistors in series. What is their equivalent resistance R eq? V ab = V ax + V xy + V yb = I (R 1 + R 2 + R 3 ) R eq = R 1 + R 2 + R 3 (Resistors in Series) (1) The equivalent resistance of a series combination equals the sum of the individual resistances. 1
2 Figure 2: This figure shows the different combinations one can have for resistors in series and resistors in parallel. 2
3 1.2 Resistors in Parallel I = I 1 + I 2 + I 3 = V ab ( 1 R R R 3 ) = V ab R eq Figure 3: This figure shows three resistors in parallel. What is their equivalent resistance R eq? 1 R eq = ( ) R 1 R 2 R 3 (Resistors in Parallel) (2) The reciprocal of the equivalent resistance of a parallel combination equals the sum of the reciprocals of the individual resistances. 3
4 Example: Calculate the power provided by the battery, and the power output of each incandescent light bulb (R = 2Ω) depending upon whether the light bulbs are powered as shown (a) in series or (b) in parallel. Figure 4: This figure shows two incandescent light bulbs, each with resistance R = 2Ω, powered by a single battery. In figure (a) the light bulbs are in series, while in figure (b) the light bulbs are in parallel. 4
5 2 Kirchhoff s Rules Many practical resistor networks cannot be reduced to simple series-parallel combinations. An example of this is shown in Fig. 5 where emf E 1 is charging a battery with a smaller emf E 2. Figure 5: This figure shows a more complicated circuit where two batteries are in a multi-loop circuit. This network cannot be reduced to a simple series-parallel combination of resistors. In this particular example emf E 1 is assumed to be charging emf E 2. To analyze these more complicated networks, we ll use the techniques developed by the German physicist Gustav Robert Kirchhoff ( ). First, we need to introduce two bits of terminology when analyzing these circuits. A junction in a circuit is a point where three of more conductors meet. A loop is any closed conducting path. 5
6 Kirchhoff s Junction Rule I = 0 (3) Figure 6: This figure shows three resistors in parallel. What is their equivalent resistance R eq? Kirchhoff s Loop Rule V = 0 (4) 2.1 Sign Conventions for the Loop Rule Figure 7: Use these sign conventions when you apply Kirchhoff s loop rule. The Travel direction going around the loop is not necessary the direction of the current. 6
7 Example: Figure 8: In this example we travel around the loop in the same direction as the assumed current, so all the IR terms are negative. Meanwhile, the 4V battery represents an emf-drop, and the 12V battery represents an emf-rise. 3 Electrical Measuring Instruments 3.1 Ammeters 3.2 Voltmeters 3.3 Ohmmeters 3.4 The Potentiometer 7
8 4 R-C Circuits Up until now, we have assumed that all the emfs and resistances are constant (i.e., time independent) so that all the potentials, currents, and powers are also independent of time. However, by simply charging a capacitor results, we find that none of these physical quantities are independent of time. Figure 9: This figure shows (a) a capacitor completely uncharged before the switch is closed. Meanwhile figure (b) shows the capacitor in the process of being charged after the switch is closed. 4.1 Charging a Capacitor v ab = ir v bc = q C (voltage drops) 8
9 Using Krichhoff s loop rule we find: While the capacitor is being charged: E ir q C = 0 (5) i = E R q RC dq dt = 1 RC q(t) = Q 0 ( 1 e t/rc ) (q CE) After the capacitor is charged the current i = 0. (Charging the capacitor) (6) E R = Q 0 RC where Q 0 = CE the final charge Time Constant τ While investigating Eq. 6, we realize that the charge on the capacitor asymptotically approaches the final charge Q 0, but only as t. So, is there a figure of merit (e.g., a time) that can describe when the capacitor is close to being completely charged? The answer is, Yes, and it s called the time constant: τ = RC. The rule-ofthumb is that the capacitor is essentially charged when t = 5 τ = 5 RC. 9
10 4.2 Discharging a Capacitor Let s suppose we have a capacitor that is complete charged q = Q 0 and we discharge it. What is the charge on the capacitor as a function of time q(t). Figure 10: Before the switch is closed at time t = 0, the capacitor is fully-charged with q = Q 0, and the current is zero as shown in figure (a). In figure (b), the switch is closed and the charge is released from the capacitor and defined by q(t). This results in a current that also varies as a function of time i(t). While the capacitor is being discharged, Kirchhoff s loop rule gives rise to the following equation: The solution to this equation is: i = dq dt = q RC 10
11 q(t) = Q o e t/rc (Discharging the Capacitor) (7) Let s take a brief look at the power distribution in the circuit while charging the capacitor. Multiply Eq. 5 by i to obtain the instantaneous power P (t): ie = i 2 R + iq C (8) 5 Power Distribution Systems Figure 11: This schematic diagram shows part of a house wiring system. Only two branch circuits are shown; lamps and appliances may be plugged into the outlets. 11
12 5.1 Circuit Overloads and Short Circuits Figure 12: When a drill malfunctions when connected via a three-prong plug, a person touching it receives no shock, because electric charge flows through the ground wire (shown in green) to the third prong and into the local ground rather than into the person s body. 5.2 Household and Automotive Wiring 12
Chapter 26 Direct-Current Circuits
Chapter 26 Direct-Current Circuits 1 Resistors in Series and Parallel In this chapter we introduce the reduction of resistor networks into an equivalent resistor R eq. We also develop a method for analyzing
More informationChapter 28. Direct Current Circuits
Chapter 28 Direct Current Circuits Circuit Analysis Simple electric circuits may contain batteries, resistors, and capacitors in various combinations. For some circuits, analysis may consist of combining
More informationChapter 28. Direct Current Circuits
Chapter 28 Direct Current Circuits Circuit Analysis Simple electric circuits may contain batteries, resistors, and capacitors in various combinations. For some circuits, analysis may consist of combining
More informationElectromotive Force. The electromotive force (emf), ε, of a battery is the maximum possible voltage that the battery can provide between its terminals
Direct Current When the current in a circuit has a constant magnitude and direction, the current is called direct current Because the potential difference between the terminals of a battery is constant,
More informationSuperconductors A class of materials and compounds whose resistances fall to virtually zero below a certain temperature, T C T C is called the critical temperature The graph is the same as a normal metal
More informationChapter 19 Lecture Notes
Chapter 19 Lecture Notes Physics 2424 - Strauss Formulas: R S = R 1 + R 2 +... C P = C 1 + C 2 +... 1/R P = 1/R 1 + 1/R 2 +... 1/C S = 1/C 1 + 1/C 2 +... q = q 0 [1-e -t/(rc) ] q = q 0 e -t/(rc τ = RC
More informationDC Circuits. Electromotive Force Resistor Circuits. Kirchoff s Rules. RC Circuits. Connections in parallel and series. Complex circuits made easy
DC Circuits Electromotive Force esistor Circuits Connections in parallel and series Kirchoff s ules Complex circuits made easy C Circuits Charging and discharging Electromotive Force (EMF) EMF, E, is the
More informationDirect-Current Circuits. Physics 231 Lecture 6-1
Direct-Current Circuits Physics 231 Lecture 6-1 esistors in Series and Parallel As with capacitors, resistors are often in series and parallel configurations in circuits Series Parallel The question then
More informationChapter 26 Direct-Current and Circuits. - Resistors in Series and Parallel - Kirchhoff s Rules - Electric Measuring Instruments - R-C Circuits
Chapter 26 Direct-Current and Circuits - esistors in Series and Parallel - Kirchhoff s ules - Electric Measuring Instruments - -C Circuits . esistors in Series and Parallel esistors in Series: V ax I V
More informationChapter 18. Direct Current Circuits -II
Chapter 18 Direct Current Circuits -II So far A circuit consists of three-four elements: Electromotive force/power supply/battery capacitors, resistors inductors Analyzed circuits with capacitors or resistors
More informationCircuits. PHY2054: Chapter 18 1
Circuits PHY2054: Chapter 18 1 What You Already Know Microscopic nature of current Drift speed and current Ohm s law Resistivity Calculating resistance from resistivity Power in electric circuits PHY2054:
More informationPhysics 115. General Physics II. Session 24 Circuits Series and parallel R Meters Kirchoff s Rules
Physics 115 General Physics II Session 24 Circuits Series and parallel R Meters Kirchoff s Rules R. J. Wilkes Email: phy115a@u.washington.edu Home page: http://courses.washington.edu/phy115a/ 5/15/14 Phys
More informationChapter 28. Direct Current Circuits
Chapter 28 Direct Current Circuits Electromotive Force An electromotive force device, or emf device, is a source of constant potential. The emf describes the work done per unit charge and has units of
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 informationPower lines. Why do birds sitting on a high-voltage power line survive?
Power lines At large distances, the resistance of power lines becomes significant. To transmit maximum power, is it better to transmit high V, low I or high I, low V? (a) high V, low I (b) low V, high
More informationAC vs. DC Circuits. Constant voltage circuits. The voltage from an outlet is alternating voltage
Circuits AC vs. DC Circuits Constant voltage circuits Typically referred to as direct current or DC Computers, logic circuits, and battery operated devices are examples of DC circuits The voltage from
More informationChapter 7 Direct-Current Circuits
Chapter 7 Direct-Current Circuits 7. Introduction... 7. Electromotive Force... 7.3 Resistors in Series and in Parallel... 4 7.4 Kirchhoff s Circuit Rules... 6 7.5 Voltage-Current Measurements... 8 7.6
More informationChapter 28 Solutions
Chapter 8 Solutions 8.1 (a) P ( V) R becomes 0.0 W (11.6 V) R so R 6.73 Ω (b) V IR so 11.6 V I (6.73 Ω) and I 1.7 A ε IR + Ir so 15.0 V 11.6 V + (1.7 A)r r 1.97 Ω Figure for Goal Solution Goal Solution
More informationAP Physics C. Electric Circuits III.C
AP Physics C Electric Circuits III.C III.C.1 Current, Resistance and Power The direction of conventional current Suppose the cross-sectional area of the conductor changes. If a conductor has no current,
More informationLecture Outline Chapter 21. Physics, 4 th Edition James S. Walker. Copyright 2010 Pearson Education, Inc.
Lecture Outline Chapter 21 Physics, 4 th Edition James S. Walker Chapter 21 Electric Current and Direct- Current Circuits Units of Chapter 21 Electric Current Resistance and Ohm s Law Energy and Power
More informationVersion 001 CIRCUITS holland (1290) 1
Version CIRCUITS holland (9) This print-out should have questions Multiple-choice questions may continue on the next column or page find all choices before answering AP M 99 MC points The power dissipated
More informationElectricity & Magnetism
Electricity & Magnetism D.C. Circuits Marline Kurishingal Note : This chapter includes only D.C. In AS syllabus A.C is not included. Recap... Electrical Circuit Symbols : Draw and interpret circuit diagrams
More informationELECTRIC CURRENTS D R M A R T A S T A S I A K D E P A R T M E N T O F C Y T O B I O L O G Y A N D P R O T E O M I C S
ELECTRIC CURRENTS D R M A R T A S T A S I A K D E P A R T M E N T O F C Y T O B I O L O G Y A N D P R O T E O M I C S lecture based on 2016 Pearson Education, Ltd. The Electric Battery Electric Current
More informationphysics for you February 11 Page 68
urrent Electricity Passage 1 4. f the resistance of a 1 m length of a given wire t is observed that good conductors of heat are also is 8.13 10 3 W, and it carried a current 1, the good conductors of electricity.
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 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 informationPH 222-2C Fall Circuits. Lectures Chapter 27 (Halliday/Resnick/Walker, Fundamentals of Physics 8 th edition)
PH 222-2C Fall 2012 Circuits Lectures 11-12 Chapter 27 (Halliday/Resnick/Walker, Fundamentals of Physics 8 th edition) 1 Chapter 27 Circuits In this chapter we will cover the following topics: -Electromotive
More informationCircuits. David J. Starling Penn State Hazleton PHYS 212
Invention is the most important product of man s creative brain. The ultimate purpose is the complete mastery of mind over the material world, the harnessing of human nature to human needs. - Nikola Tesla
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 Circuits. February 18, 2014 Physics for Scientists & Engineers 2, Chapter 26 1
Direct Current Circuits February 18, 2014 Physics for Scientists & Engineers 2, Chapter 26 1 Kirchhoff s Junction Rule! The sum of the currents entering a junction must equal the sum of the currents leaving
More informationChapter 27. Circuits
Chapter 27 Circuits 1 1. Pumping Chagres We need to establish a potential difference between the ends of a device to make charge carriers follow through the device. To generate a steady flow of charges,
More informationChapter 6 DIRECT CURRENT CIRCUITS. Recommended Problems: 6,9,11,13,14,15,16,19,20,21,24,25,26,28,29,30,31,33,37,68,71.
Chapter 6 DRECT CURRENT CRCUTS Recommended Problems: 6,9,,3,4,5,6,9,0,,4,5,6,8,9,30,3,33,37,68,7. RESSTORS N SERES AND N PARALLEL - N SERES When two resistors are connected together as shown we said that
More informationChapter 28: DC and RC Circuits Kirchhoff s Rules
Chapter 28: DC and RC Circuits Kirchhoff s Rules Series Circuits The current is the same in each device. The equivalent resistance of the circuit is the sum of the individual resistances. Parallel Circuits
More informationCircuits. 1. The Schematic
+ ircuits 1. The Schematic 2. Power in circuits 3. The Battery 1. eal Battery vs. Ideal Battery 4. Basic ircuit nalysis 1. oltage Drop 2. Kirchoff s Junction Law 3. Series & Parallel 5. Measurement Tools
More informationClicker Session Currents, DC Circuits
Clicker Session Currents, DC Circuits Wires A wire of resistance R is stretched uniformly (keeping its volume constant) until it is twice its original length. What happens to the resistance? 1) it decreases
More informationCircuits Practice Websheet 18.1
Circuits Practice Websheet 18.1 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. How much power is being dissipated by one of the 10-Ω resistors? a. 24
More informationPEP 2017 Assignment 12
of the filament?.16.. Aductile metal wire has resistance. What will be the resistance of this wire in terms of if it is stretched to three times its original length, assuming that the density and resistivity
More informationEXPERIMENT 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
More informationLecture 12 Chapter 28 RC Circuits Course website:
Lecture 12 Chapter 28 RC Circuits Course website: http://faculty.uml.edu/andriy_danylov/teaching/physicsii Today we are going to discuss: Chapter 28: Section 28.9 RC circuits Steady current Time-varying
More informationTopic 5.2 Heating Effect of Electric Currents
Topic 5.2 Heating Effect of Electric Currents Kari Eloranta 2017 Jyväskylän Lyseon lukio International Baccalaureate February 14, 2017 Topic 5.2 Heating Effect of Electric Currents In subtopic 5.2 we study
More informationChapter 26: Direct-Current Circuits (Part 2)
Chapter 26: Direct-Current Circuits (Part 2) Electrical measuring instruments (con d) RC circuits Electrical Safety Phys 2435: Chap. 26, Pg 1 Electrical Measuring Instruments New Topic Phys 2435: Chap.
More informationCapacitance. 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
More informationRC Circuits. Lecture 13. Chapter 31. Physics II. Course website:
Lecture 13 Chapter 31 Physics II RC Circuits Course website: http://faculty.uml.edu/andriy_danylov/teaching/physicsii Lecture Capture: http://echo360.uml.edu/danylov201415/physics2spring.html Steady current
More informationPHYSICS 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
More informationLecture 11. Power in Electric Circuits, Kirchhoff s Rules
Lecture 11. Power in Electric Circuits, Kirchhoff s Rules Outline: Energy and power in electric circuits. Voltage and Current Sources. Kirchhoff s Rules. Lecture 10: Connection of resistors in parallel
More informationExam 3--PHYS 102--S14
Name: Exam 3--PHYS 102--S14 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which of these statements is always true? a. resistors in parallel have the
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 informationPhysics 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
More informationM. C. Escher: Waterfall. 18/9/2015 [tsl425 1/29]
M. C. Escher: Waterfall 18/9/2015 [tsl425 1/29] Direct Current Circuit Consider a wire with resistance R = ρl/a connected to a battery. Resistor rule: In the direction of I across a resistor with resistance
More informationVersion 001 HW 20 Circuits C&J sizemore (21301jtsizemore) 1
Version 00 HW 20 Circuits C&J sizemore (230jtsizemore) This print-out should have 35 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. Serway
More informationChapter 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:
More informationKirchhoff s Rules. Kirchhoff s rules are statements used to solve for currents and voltages in complicated circuits. The rules are
Kirchhoff s Rules Kirchhoff s rules are statements used to solve for currents and voltages in complicated circuits. The rules are Rule. Sum of currents into any junction is zero. i = 0 i 1 2 = 12 Why?
More informationLecture 16 - Circuit Problems
Lecture 16 - Circuit Problems A Puzzle... Crash Course in Circuits Compute the change in voltage from point A to point B (in other words, the voltage difference V B - V A ) in the following cases. Current
More informationLaboratory 7: Charging and Discharging a Capacitor Prelab
Phys 132L Fall 2018 Laboratory 7: Charging and Discharging a Capacitor Prelab Consider a capacitor with capacitance C connected in series to a resistor with resistance R as shown in Fig. 1. Theory predicts
More information11. ELECTRIC CURRENT. Questions and Answers between the forces F e and F c. 3. Write the difference between potential difference and emf. A.
CLSS-10 1. Explain how electron flow causes electric current with Lorentz-Drude theory of electrons?. Drude and Lorentz, proposed that conductors like metals contain a large number of free electrons while
More informationA Review of Circuitry
1 A Review of Circuitry There is an attractive force between a positive and a negative charge. In order to separate these charges, a force at least equal to the attractive force must be applied to one
More informationElectric Currents. Resistors (Chapters 27-28)
Electric Currents. Resistors (Chapters 27-28) Electric current I Resistance R and resistors Relation between current and resistance: Ohm s Law Resistivity ρ Energy dissipated by current. Electric power
More informationLABORATORY 4 ELECTRIC CIRCUITS I. Objectives
LABORATORY 4 ELECTRIC CIRCUITS I Objectives to be able to discuss potential difference and current in a circuit in terms of electric field, work per unit charge and motion of charges to understand that
More informationElectric Currents and Circuits
Nicholas J. Giordano www.cengage.com/physics/giordano Chapter 19 Electric Currents and Circuits Marilyn Akins, PhD Broome Community College Electric Circuits The motion of charges leads to the idea of
More informationElectricity 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
More informationCh 28-DC Circuits! 1.) EMF & Terminal Voltage! 9.0 V 8.7 V 8.7 V. V =! " Ir. Terminal Open circuit internal! voltage voltage (emf) resistance" 2.
Ch 28-DC Circuits! 1.) EMF & Terminal Voltage! 9.0 V 8.7 V 8.7 V V =! " Ir Terminal Open circuit internal! voltage voltage (emf) resistance" 2.) Resistors in series! One of the bits of nastiness about
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 informationRC Circuits (32.9) Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
(32.9) We have only been discussing DC circuits so far. However, using a capacitor we can create an RC circuit. In this example, a capacitor is charged but the switch is open, meaning no current flows.
More informationConcepTest PowerPoints
ConcepTest PowerPoints Chapter 19 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 informationPhysics 212 Midterm 2 Form A
1. A wire contains a steady current of 2 A. The charge that passes a cross section in 2 s is: A. 3.2 10-19 C B. 6.4 10-19 C C. 1 C D. 2 C E. 4 C 2. In a Physics 212 lab, Jane measures the current versus
More informationInductance, Inductors, RL Circuits & RC Circuits, LC, and RLC Circuits
Inductance, Inductors, RL Circuits & RC Circuits, LC, and RLC Circuits Self-inductance A time-varying current in a circuit produces an induced emf opposing the emf that initially set up the timevarying
More informationPhysics 1214 Chapter 19: Current, Resistance, and Direct-Current Circuits
Physics 1214 Chapter 19: Current, Resistance, and Direct-Current Circuits 1 Current current: (also called electric current) is an motion of charge from one region of a conductor to another. Current When
More informationPHY 1214 General Physics II
PHY 1214 General Physics II Lecture 14 Grounding, RC Circuits June 27, 2005 Weldon J. Wilson Professor of Physics & Engineering Howell Hall 221H wwilson@ucok.edu Lecture Schedule (Weeks 4-6) We are here.
More informationCurrent. I = ei e = en e Av d. The current, which is Coulomb s per second, is simply
Current The current, which is Coulomb s per second, is simply I = ei e = en e Av d e is the charge is the electron! ne is the density of electrons! A is the cross sectional area of the wire! vd is the
More informationThis work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 License.
University of Rhode Island DigitalCommons@URI PHY 204: Elementary Physics II Physics Course Materials 2015 11. RC Circuits Gerhard Müller University of Rhode Island, gmuller@uri.edu Creative Commons License
More informationCircuits Gustav Robert Kirchhoff 12 March October 1887
Welcome Back to Physics 1308 Circuits Gustav Robert Kirchhoff 12 March 1824 17 October 1887 Announcements Assignments for Thursday, October 18th: - Reading: Chapter 28.1-28.2, 28.4 - Watch Video: https://youtu.be/39vkt4cc5nu
More informationChapter 16. Current and Drift Speed. Electric Current, cont. Current and Drift Speed, cont. Current and Drift Speed, final
Chapter 6 Current, esistance, and Direct Current Circuits Electric Current Whenever electric charges of like signs move, an electric current is said to exist The current is the rate at which the charge
More informationElectricity and Magnetism DC Circuits Resistance-Capacitance Circuits
Electricity and Magnetism DC Circuits Resistance-Capacitance Circuits Lana Sheridan De Anza College Feb 12, 2018 Last time using Kirchhoff s laws Overview two Kirchhoff trick problems resistance-capacitance
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 informationR R V I R. Conventional Current. Ohms Law V = IR
DC Circuits opics EMF and erminal oltage esistors in Series and in Parallel Kirchhoff s ules EMFs in Series and in Parallel Capacitors in Series and in Parallel Ammeters and oltmeters Conventional Current
More informationPhysics 1302W.400 Lecture 21 Introductory Physics for Scientists and Engineering II
Physics 1302W.400 Lecture 21 Introductory Physics for Scientists and Engineering II In today s lecture, we will learn to: Calculate the resistance of a conductor depending on the material and shape Apply
More informationClass 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
More informationFig. 1 Fig. 2. Calculate the total capacitance of the capacitors. (i) when connected as in Fig. 1. capacitance =... µf
1. Fig.1 shows two capacitors, A of capacitance 2µF, and B of capacitance 4µF, connected in parallel. Fig. 2 shows them connected in series. A two-way switch S can connect the capacitors either to a d.c.
More informationAP Physics C. Inductance. Free Response Problems
AP Physics C Inductance Free Response Problems 1. Two toroidal solenoids are wounded around the same frame. Solenoid 1 has 800 turns and solenoid 2 has 500 turns. When the current 7.23 A flows through
More information8. Electric Currents
8. Electric Currents S. G. Rajeev January 30, 2011 An electric current is produced by the movement of electric charges. In most cases these are electrons. A conductor is a material through which an electric
More informationUse 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
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 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 informationChapter 23 Revision problem. While we are waiting, please try problem 14 You have a collection of six 1kOhm resistors.
Chapter 23 Revision problem While we are waiting, please try problem 14 You have a collection of six 1kOhm resistors. 1 Electric Circuits Elements of a circuit Circuit topology Kirchhoff s law for voltage
More informationInductance, RL Circuits, LC Circuits, RLC Circuits
Inductance, R Circuits, C Circuits, RC Circuits Inductance What happens when we close the switch? The current flows What does the current look like as a function of time? Does it look like this? I t Inductance
More information1.3 Most domestic appliances are connected to the mains electricity with a plug. Explain why a plug needs a live and a neutral wire.
4-2 Electricity Physics.0 Most domestic appliances are connected to the mains electricity.. What is the frequency of mains electricity? Tick one box [ mark].05 A 50 Hz 230 V.2 What is the potential difference
More informationELECTRICITY 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
More informationChapter 3: Electric Current And Direct-Current Circuits
Chapter 3: Electric Current And Direct-Current Circuits 3.1 Electric Conduction 3.1.1 Describe the microscopic model of current Mechanism of Electric Conduction in Metals Before applying electric field
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 informationReview. Multiple Choice Identify the letter of the choice that best completes the statement or answers the question.
Review Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. When more devices are added to a series circuit, the total circuit resistance: a.
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 informationAssessment Schedule 2016 Physics: Demonstrate understanding electrical systems (91526)
NCEA evel 3 Physics (91526) 2016 page 1 of 5 Assessment Schedule 2016 Physics: Demonstrate understanding electrical systems (91526) Evidence Statement NØ N1 N 2 A 3 A 4 M 5 M 6 E 7 E 8 0 1A 2A 3A 4A or
More informationPhysics 212. Lecture 11. RC Circuits. Change in schedule Exam 2 will be on Thursday, July 12 from 8 9:30 AM. Physics 212 Lecture 11, Slide 1
Physics 212 Lecture 11 ircuits hange in schedule Exam 2 will be on Thursday, July 12 from 8 9:30 AM. Physics 212 Lecture 11, Slide 1 ircuit harging apacitor uncharged, switch is moved to position a Kirchoff
More informationLouisiana State University Physics 2102, Exam 2, March 5th, 2009.
PRINT Your Name: Instructor: Louisiana State University Physics 2102, Exam 2, March 5th, 2009. Please be sure to PRINT your name and class instructor above. The test consists of 4 questions (multiple choice),
More informationELECTRIC CURRENT IN CONDUCTORS CHAPTER - 32
1. Q(t) t + Bt + c a) t Q Q 'T ' T t T b) Bt Q B Q 'T' t T c) C [Q] C T ELECTRIC CURRENT IN CONDUCTORS CHPTER - 3 1 1 d) Current t dq d t Bt C dt dt t + B 5 5 + 3 53.. No. of electrons per second 16 electrons
More informationThe RC Time Constant
The RC Time Constant Objectives When a direct-current source of emf is suddenly placed in series with a capacitor and a resistor, there is current in the circuit for whatever time it takes to fully charge
More informationCLASS 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
More informationPhysics 142 Steady Currents Page 1. Steady Currents
Physics 142 Steady Currents Page 1 Steady Currents If at first you don t succeed, try, try again. Then quit. No sense being a damn fool about it. W.C. Fields Electric current: the slow average drift of
More informationCURRENT ELECTRICITY The charge flowing any cross-section per unit time in a conductor is called electric current.
CUENT ELECTICITY Important Points:. Electric Current: The charge flowing any cross-section per unit time in a conductor is called electric current. Electric Current I q t. Current Density: a) The current
More informationMasteringPhysics: Assignment Print View. Problem 30.50
Page 1 of 15 Assignment Display Mode: View Printable Answers phy260s08 homework 13 Due at 11:00pm on Wednesday, May 14, 2008 View Grading Details Problem 3050 Description: A 15-cm-long nichrome wire is
More information