# Switch. R 5 V Capacitor. ower upply. Voltmete. Goals. Introduction

Size: px
Start display at page:

Transcription

1 Switch Lab 6. Circuits ower upply Goals + + R 5 V Capacitor V To appreciate the capacitor as a charge storage device. To measure the voltage across a capacitor as it discharges through a resistor, and to compare the result with the expected, theoretical behavior. To use a semilogarithmic graph to verify that experimental data is well described by an exponential decay and to determine the decay parameters. To determine the apparent internal resistance of a digital multimeter. Introduction A diagram of a simple resistor-capacitor () circuit appears in Figure 6.1. A power supply is used to charge the capacitor. 3 During V this 12 process, 30 charge is transferred 20 from one side of the capacitor to the other. A digital multimeter set on a voltage scale behaves in a circuit like a large (in ohms) resistor. When the power supply is disconnected from the capacitor, charge leaks from one side of the capacitor, through this resistor, back to the other side of the capacitor, until no voltage appears across the terminals of the capacitor. Switch Voltmete Power Supply V R V Capacitor Voltmeter Figure 6.1. Diagram of circuit and power supply. The power supply in Figure 6.1 is represented by a battery. Note that the positive output of the power supply is connected to the plate of the capacitor marked with a plus sign. The capacitors used in this experiment make use of a thin layer of dielectric material that forms by a chemical 31

2 32 CHAPTER 6. CIUITS (electrolytic) reaction when the appropriate voltage is placed across the capacitor. These layers can be quite thin and uniform. Electrolytic capacitors can be made inexpensively and are widely used in power supplies. As you may remember from chemistry, the sign of the voltage is critical in electrolytic reactions. Make sure that the plus end of the capacitor is connected to the plus output of the power supply in your circuit. The voltmeter in Figure 6.1 is enclosed by a dashed line. The voltage sensing circuit is represented by a circle with a V inside. All voltmeters have resistance, and this resistance is represented by the resistor symbol inside the box. Our goal is to measure the value of this resistance, R. Theory We plan to monitor the voltage across the capacitor as a function of time after the switch is opened. The functional form of this dependence can be derived by circuit analysis. Let Q be the charge on the top plate of the capacitor. To produce a positive charge Q on the top plate of the capacitor, a charge of equal magnitude must be removed from the bottom plate. This produces a potential difference V C across the capacitor, V C = Q C (6.1) where C is the capacitance of the capacitor. Likewise, when a current I flows through a resistor with resistance R, a potential difference V R appears across the resistor, where V R = IR (6.2) When the switch in Figure 6.1 is closed, a positive charge Q = V C, where V = 5 V, is on the top plate of the capacitor. At the same time, a negative charge Q is on the bottom plate of the capacitor and a current I = V /R flows through the resistor. When the switch is opened, electrons continue to flow through the resistor, but now they reduce the charge on the capacitor. The amount of charge per unit time that flows from one plate of the capacitor to the other, dq/dt, will equal the current I through the resistor. Since Q is decreasing, dq/dt is negative. And since I = dq dt (6.3) both I must also be negative. Further, the top of the capacitor in Figure 6.1 is connected by a conducting wire to the top of the resistor, and the bottom of the capacitor is connected to the bottom of the resistor. Therefore, the potential differences across the capacitor and the resistor must be equal, that is, V C = V R. Initially, both quantities are positive. Then Q C = RdQ dt (6.4)

4 34 CHAPTER 6. CIUITS point, y avg. The top and bottom bars mark the maximum and minimum values (y max and y min ) on either end of the range of y-values within one standard deviation (σ) of y avg. Thus the top bar is located at y max = y avg + σ, while the bottom bar is located at y min = y avg σ. Get help from your TA if you aren t sure how to plot error bars in Excel. y max y avg y min t Figure 6.2. Diagram of a data point with upper and lower error bars. y 1max Clearly this is not a linear graph. To determine the value of, one could perform an exponential y 1avg z curve fit using Excel. However, Excel s curve fit function does 1avg not provide z2max the uncertainty estimate we need. Excel s Regression function will provide an uncertainty, but it requires a linear function. y 1min z 1min z 2avg y Taking the natural logarithm of both 2max The values y 1avg sides and y 2avg of Equation 6.6 will produce the linear equation we z 2min are not consistent, because need. y 2avg their uncertainty ranges The values z 1avg and z 2avg are do not overlap. consistent because their y 2min uncertainty ranges overlap. z 1max ln V C (t) = ln( V 0 ) t A plot of ln[ V C (t)] vs t should produce a line of slope t/ and that equals ln( V 0 ) at time t = 0. The intercept is not very useful this case, because we already know V 0. The slope, however, gives us 1/. Assuming that the value of C marked on the capacitor is reasonably accurate, we can calculate R, the internal resistance of the meter. In practice, the uncertainty in the marked value of C is ±20%. With this and the uncertainty (standard error) in the slope given by Excel s Regression feature, we can estimate the uncertainty in R. A plot of log 10 y or or log e y versus x (or t) is called a semilog graph. (The logarithm appears on only one of the two axes.) Plot a semilog graph of your data. Again include the error bars with each plotted point. Does your graph support the hypothesis that the relationship between the voltage and time is an exponential function? Using the value of C marked on your capacitor, compute the value of the R of the voltmeter and compare it to the value from the manufacturer s specification. The internal resistance of an inexpensive voltmeter Repeat your measurements of V C (t) versus time using the relatively inexpensive (smaller, red or black) digital voltmeter at your lab station. Repeat the analysis above to determine its internal resistance. How does it compare with the internal resistance of the relatively expensive Fluke digital voltmeter? The internal resistance of a voltmeter is one measure of its quality. To measure the potential difference across a component with a high resistance, the internal resistance of your voltmeter (6.7)

5 should be much higher than the resistance of the component. A voltmeter with a high internal resistance can be used in applications where the measurement error of a meter with a low internal resistance would be unacceptably high. Summary Begin by filling in the blanks of the argument for a simple exponential function being a straight line when plotted semi-logarithmically. Then state your findings clearly, succinctly, and completely. 35 Before you leave the lab please: Turn off the power to all the equipment, including the battery-powered digital voltmeters. Please put all leads and small components in the plastic tray provided. Report any problems or suggest improvements to your TA.

### Switch. R 5 V Capacitor. ower upply. Voltmete. Goals. Introduction

Switch Lab 6. Circuits ower upply Goals + + R 5 V Capacitor V To appreciate the capacitor as a charge storage device. To measure the voltage across a capacitor as it discharges through a resistor, and

### Switch. R 5 V Capacitor. ower upply. Voltmete. Goals. Introduction

Switch Lab 9. Circuits ower upply Goals + + R 5 V Capacitor V To appreciate the capacitor as a charge storage device. To measure the voltage across a capacitor as it discharges through a resistor, and

### Lab 6. RC Circuits. Switch R 5 V. ower upply. Voltmete. Capacitor. Goals. Introduction

Switch ower upply Lab 6. RC Circuits + + R 5 V Goals Capacitor V To appreciate the capacitor as a charge storage device. To measure the voltage across a capacitor as it discharges through a resistor, and

### Switch + R. ower upply. Voltmete. Capacitor. Goals. Introduction

Lab 6. Switch RC Circuits ower upply Goals To appreciate the capacitor as a charge storage device. To measure the voltage across a capacitor as it discharges through a resistor, and to compare + the result

### Experiment FT1: Measurement of Dielectric Constant

Experiment FT1: Measurement of Dielectric Constant Name: ID: 1. Objective: (i) To measure the dielectric constant of paper and plastic film. (ii) To examine the energy storage capacity of a practical capacitor.

### Practical 1 RC Circuits

Objectives Practical 1 Circuits 1) Observe and qualitatively describe the charging and discharging (decay) of the voltage on a capacitor. 2) Graphically determine the time constant for the decay, τ =.

### EXPERIMENT 5A RC Circuits

EXPERIMENT 5A Circuits Objectives 1) Observe and qualitatively describe the charging and discharging (decay) of the voltage on a capacitor. 2) Graphically determine the time constant for the decay, τ =.

### The 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

### Experiment 4. RC Circuits. Observe and qualitatively describe the charging and discharging (decay) of the voltage on a capacitor.

Experiment 4 RC Circuits 4.1 Objectives Observe and qualitatively describe the charging and discharging (decay) of the voltage on a capacitor. Graphically determine the time constant τ for the decay. 4.2

### Lab 10: DC RC circuits

Name: Lab 10: DC RC circuits Group Members: Date: TA s Name: Objectives: 1. To understand current and voltage characteristics of a DC RC circuit 2. To understand the effect of the RC time constant Apparatus:

### Laboratory 3 Measuring Capacitor Discharge with the MicroBLIP

Laboratory 3 page 1 of 6 Laboratory 3 Measuring Capacitor Discharge with the MicroBLIP Introduction In this lab, you will use the MicroBLIP in its Data Acquisition Mode to sample the voltage over time

### University of TN Chattanooga Physics 1040L 8/18/2012 PHYSICS 1040L LAB LAB 4: R.C. TIME CONSTANT LAB

PHYSICS 1040L LAB LAB 4: R.C. TIME CONSTANT LAB OBJECT: To study the discharging of a capacitor and determine the time constant for a simple circuit. APPARATUS: Capacitor (about 24 μf), two resistors (about

### Lab 5 - Capacitors and RC Circuits

Lab 5 Capacitors and RC Circuits L51 Name Date Partners Lab 5 Capacitors and RC Circuits OBJECTIVES To define capacitance and to learn to measure it with a digital multimeter. To explore how the capacitance

### Lab 08 Capacitors 2. Figure 2 Series RC circuit with SPDT switch to charge and discharge capacitor.

Lab 08: Capacitors Last edited March 5, 2018 Learning Objectives: 1. Understand the short-term and long-term behavior of circuits containing capacitors. 2. Understand the mathematical relationship between

### Measurement of Electrical Resistance and Ohm s Law

Measurement of Electrical Resistance and Ohm s Law Objectives In this experiment, measurements of the voltage across a wire coil and the current in the wire coil will be used to accomplish the following

### Laboratory 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

### Figure 1: Capacitor circuit

Capacitors INTRODUCTION The basic function of a capacitor 1 is to store charge and thereby electrical energy. This energy can be retrieved at a later time for a variety of uses. Often, multiple capacitors

### ENERGY AND TIME CONSTANTS IN RC CIRCUITS By: Iwana Loveu Student No Lab Section: 0003 Date: February 8, 2004

ENERGY AND TIME CONSTANTS IN RC CIRCUITS By: Iwana Loveu Student No. 416 614 5543 Lab Section: 0003 Date: February 8, 2004 Abstract: Two charged conductors consisting of equal and opposite charges forms

### first name (print) last name (print) brock id (ab17cd) (lab date)

(ta initials) first name (print) last name (print) brock id (ab17cd) (lab date) Experiment 1 Capacitance In this Experiment you will learn the relationship between the voltage and charge stored on a capacitor;

### Lab 5 CAPACITORS & RC CIRCUITS

L051 Name Date Partners Lab 5 CAPACITORS & RC CIRCUITS OBJECTIVES OVERVIEW To define capacitance and to learn to measure it with a digital multimeter. To explore how the capacitance of conducting parallel

### Lab 5 - Capacitors and RC Circuits

Lab 5 Capacitors and RC Circuits L51 Name Date Partners Lab 5 Capacitors and RC Circuits OBJECTIVES To define capacitance and to learn to measure it with a digital multimeter. To explore how the capacitance

### Direct 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

### Laboratory Worksheet Experiment NE04 - RC Circuit Department of Physics The University of Hong Kong. Name: Student ID: Date:

PHYS1050 / PHYS1250 Laboratory Worksheet Experiment Department of Physics The University of Hong Kong Ref. (Staff Use) Name: Student ID: Date: Draw a schematic diagram of the charging RC circuit with ammeter

### Chapter 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

### [1] (b) Fig. 1.1 shows a circuit consisting of a resistor and a capacitor of capacitance 4.5 μf. Fig. 1.1

1 (a) Define capacitance..... [1] (b) Fig. 1.1 shows a circuit consisting of a resistor and a capacitor of capacitance 4.5 μf. S 1 S 2 6.3 V 4.5 μf Fig. 1.1 Switch S 1 is closed and switch S 2 is left

### LABORATORY 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

### Review of Ohm's Law: The potential drop across a resistor is given by Ohm's Law: V= IR where I is the current and R is the resistance.

DC Circuits Objectives The objectives of this lab are: 1) to construct an Ohmmeter (a device that measures resistance) using our knowledge of Ohm's Law. 2) to determine an unknown resistance using our

### Physics Investigation 10 Teacher Manual

Physics Investigation 10 Teacher Manual Observation When a light bulb is connected to a number of charged capacitors, it lights up for different periods of time. Problem What does the rate of discharging

### Lab 4 RC Circuits. Name. Partner s Name. I. Introduction/Theory

Lab 4 RC Circuits Name Partner s Name I. Introduction/Theory Consider a circuit such as that in Figure 1, in which a potential difference is applied to the series combination of a resistor and a capacitor.

### Simple circuits - 3 hr

Simple circuits - 3 hr Resistances in circuits Analogy of water flow and electric current An electrical circuit consists of a closed loop with a number of different elements through which electric current

### Physics 220: Worksheet 7

(1 A resistor R 1 =10 is connected in series with a resistor R 2 =100. A current I=0.1 A is present through the circuit. What is the power radiated in each resistor and also in the total circuit? (2 A

### Version 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

### Lab #6 Ohm s Law. Please type your lab report for Lab #6 and subsequent labs.

Dr. Day, Fall 2004, Rev. 06/22/10 HEFW PH 262 Page 1 of 4 Lab #6 Ohm s Law Please type your lab report for Lab #6 and subsequent labs. Objectives: When you have completed this lab exercise you should be

### Physics 248, Spring 2009 Lab 7: Capacitors and RC-Decay

Name Section Physics 248, Spring 2009 Lab 7: Capacitors and RC-Decay Your TA will use this sheet to score your lab. It is to be turned in at the end of lab. To receive full credit you must use complete

### PHYS 2212L - Principles of Physics Laboratory II

PHYS 2212L - Principles of Physics Laboratory II Laboratory Advanced Sheet Resistors 1. Objectives. The objectives of this laboratory are a. to verify the linear dependence of resistance upon length of

### On the axes of Fig. 4.1, carefully sketch a graph to show how the potential difference V across the capacitor varies with time t. Label this graph L.

1 (a) A charged capacitor is connected across the ends of a negative temperature coefficient (NTC) thermistor kept at a fixed temperature. The capacitor discharges through the thermistor. The potential

### Dr. Julie J. Nazareth

Name: Dr. Julie J. Nazareth Lab Partner(s): Physics: 133L Date lab performed: Section: Capacitors Parts A & B: Measurement of capacitance single, series, and parallel combinations Table 1: Voltage and

### Electromotive 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,

### Lab 4 CAPACITORS & RC CIRCUITS

67 Name Date Partners Lab 4 CAPACITORS & RC CIRCUITS OBJECTIVES OVERVIEW To define capacitance and to learn to measure it with a digital multimeter. To explore how the capacitance of conducting parallel

### Experiment 8: Capacitance and the Oscilloscope

Experiment 8: Capacitance and the Oscilloscope Nate Saffold nas2173@columbia.edu Office Hour: Mondays, 5:30PM-6:30PM @ Pupin 1216 INTRO TO EXPERIMENTAL PHYS-LAB 1493/1494/2699 Outline Capacitance: Capacitor

### Chapter 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

### PHYSICS 122 Lab EXPERIMENT NO. 6 AC CIRCUITS

PHYSICS 122 Lab EXPERIMENT NO. 6 AC CIRCUITS The first purpose of this laboratory is to observe voltages as a function of time in an RC circuit and compare it to its expected time behavior. In the second

### Lab 5 RC Circuits. What You Need To Know: Physics 212 Lab

Lab 5 R ircuits What You Need To Know: The Physics In the previous two labs you ve dealt strictly with resistors. In today s lab you ll be using a new circuit element called a capacitor. A capacitor consists

### NAME: BATTERY IS TURNED ON TO +1.5 V. BATTERY IS TURNED ON TO -1.5 V.

AP PHYSICS 2 LAB: CAPACITANCE NAME: Google: Phet capacitor lab PART I CAPACITOR Go to the tab Dielectric Increase the plate area to 4. mm 2. Make sure the offset of the dielectric is. mm. Make sure the

### Name: Lab Partner: Section:

Chapter 6 Capacitors and RC Circuits Name: Lab Partner: Section: 6.1 Purpose The purpose of this experiment is to investigate the physics of capacitors in circuits. The charging and discharging of a capacitor

### farads or 10 µf. The letter indicates the part tolerance (how close should the actual value be to the marking).

p1 EE1050/60 Capacitors Lab University of Utah Electrical Engineering Department EE1050/1060 Capacitors A. Stolp, 10/4/99 rev 3/17/01 Objectives 1.) Observe charging and discharging of a capacitor. 2.)

### Fig. 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.

### Capacitors. Chapter How capacitors work Inside a capacitor

Chapter 6 Capacitors In every device we have studied so far sources, resistors, diodes and transistors the relationship between voltage and current depends only on the present, independent of the past.

### Phys 2025, First Test. September 20, minutes Name:

Phys 05, First Test. September 0, 011 50 minutes Name: Show all work for maximum credit. Each problem is worth 10 points. Work 10 of the 11 problems. k = 9.0 x 10 9 N m / C ε 0 = 8.85 x 10-1 C / N m e

### Experiment 4: Resistances in Circuits

Name: Partners: Date: Experiment 4: Resistances in Circuits EQUIPMENT NEEDED: Circuits Experiment Board Multimeter Resistors Purpose The purpose of this lab is to begin experimenting with the variables

### PHY222 - Lab 7 RC Circuits: Charge Changing in Time Observing the way capacitors in RC circuits charge and discharge.

PHY222 Lab 7 RC Circuits: Charge Changing in Time Observing the way capacitors in RC circuits charge and discharge. Print Your Name Print Your Partners' Names You will return this handout to the instructor

### Electricity and Light Pre Lab Questions

Electricity and Light Pre Lab Questions The pre lab questions can be answered by reading the theory and procedure for the related lab. You are strongly encouraged to answers these questions on your own.

### LAB 3: Capacitors & RC Circuits

LAB 3: Capacitors & C Circuits Name: Circuits Experiment Board Wire leads Capacitors, esistors EQUIPMENT NEEDED: Two D-cell Batteries Multimeter Logger Pro Software, ULI Purpose The purpose of this lab

### A capacitor is a device that stores electric charge (memory devices). A capacitor is a device that stores energy E = Q2 2C = CV 2

Capacitance: Lecture 2: Resistors and Capacitors Capacitance (C) is defined as the ratio of charge (Q) to voltage (V) on an object: C = Q/V = Coulombs/Volt = Farad Capacitance of an object depends on geometry

### Direct-Current Circuits

Direct-Current Circuits A'.3/.". 39 '- )232.-/ 32,+/" 7+3(5-.)232.-/ 7 3244)'03,.5B )*+,"- &'&./( 0-1*234 35-2567+- *7 2829*4-& )"< 35- )*+,"-= 9-4-- 3563 A0.5.C2/'-231).D')232.')2-1 < /633-">&@5-:836+-0"1464-625"-4*43"

### PH 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

### EDEXCEL NATIONALS UNIT 5 - ELECTRICAL AND ELECTRONIC PRINCIPLES. ASSIGNMENT No.2 - CAPACITOR NETWORK

EDEXCEL NATIONALS UNIT 5 - ELECTRICAL AND ELECTRONIC PRINCIPLES ASSIGNMENT No.2 - CAPACITOR NETWORK NAME: I agree to the assessment as contained in this assignment. I confirm that the work submitted is

### Capacitors GOAL. EQUIPMENT. CapacitorDecay.cmbl 1. Building a Capacitor

PHYSICS EXPERIMENTS 133 Capacitor 1 Capacitors GOAL. To measure capacitance with a digital multimeter. To make a simple capacitor. To determine and/or apply the rules for finding the equivalent capacitance

### 7/06 Electric Fields and Energy

Part ASome standard electric field and potential configurations About this lab: Electric fields are created by electric charges and exert force on charges. Electric potential gives an alternative description.

### Chapter 8. Capacitors. Charging a capacitor

Chapter 8 Capacitors You can store energy as potential energy by pulling a bowstring, stretching a spring, compressing a gas, or lifting a book. You can also store energy as potential energy in an electric

### Capacitors. The charge Q on a capacitor s plate is proportional to the potential difference V across the Q = C V (1)

apacitors THEORY The charge Q on a capacitor s plate is proportional to the potential difference V across the capacitor. We express this with Q = V (1) where is a proportionality constant known as the

### Let s go to something more concrete

Let s go to something more concrete Let me define an electric current Whenever charges of like sign are moving, an electric current exists Suppose I have a surface A with charges (assume + because of Franklin

### Physics 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

### Besides resistors, capacitors are one of the most common electronic components that you will encounter. Sometimes capacitors are components that one

1 Besides resistors, capacitors are one of the most common electronic components that you will encounter. Sometimes capacitors are components that one would deliberately add to a circuit. Other times,

Superconductors 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

### Chapter 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,

### 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

### POLYTECHNIC UNIVERSITY Electrical Engineering Department. EE SOPHOMORE LABORATORY Experiment 2 DC circuits and network theorems

POLYTECHNIC UNIVERSITY Electrical Engineering Department EE SOPHOMORE LABORATORY Experiment 2 DC circuits and network theorems Modified for Physics 18, Brooklyn College I. Overview of Experiment In this

### Capacitance. A capacitor consists of two conductors that are close but not touching. A capacitor has the ability to store electric charge.

Capacitance A capacitor consists of two conductors that are close but not touching. A capacitor has the ability to store electric charge. a) Parallel-plate capacitor connected to battery. (b) is a circuit

### RC Circuits. Equipment: Capstone with 850 interface, RLC circuit board, 2 voltage sensors (no alligator clips), 3 leads V C = 1

R ircuits Equipment: apstone with 850 interface, RL circuit board, 2 voltage sensors (no alligator clips), 3 leads 1 Introduction The 3 basic linear circuits elements are the resistor, the capacitor, and

### Chapter 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

### AP 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,

### Chapter 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

### Chapter 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

### Physics 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

### (d) describe the action of a 555 monostable timer and then use the equation T = 1.1 RC, where T is the pulse duration

Chapter 1 - Timing Circuits GCSE Electronics Component 2: Application of Electronics Timing Circuits Learners should be able to: (a) describe how a RC network can produce a time delay (b) describe how

### What happens when things change. Transient current and voltage relationships in a simple resistive circuit.

Module 4 AC Theory What happens when things change. What you'll learn in Module 4. 4.1 Resistors in DC Circuits Transient events in DC circuits. The difference between Ideal and Practical circuits Transient

### Capacitors are devices which can store electric charge. They have many applications in electronic circuits. They include:

CAPACITORS Capacitors are devices which can store electric charge They have many applications in electronic circuits They include: forming timing elements, waveform shaping, limiting current in AC circuits

### DEPARTMENT OF COMPUTER ENGINEERING UNIVERSITY OF LAHORE

DEPARTMENT OF COMPUTER ENGINEERING UNIVERSITY OF LAHORE NAME. Section 1 2 3 UNIVERSITY OF LAHORE Department of Computer engineering Linear Circuit Analysis Laboratory Manual 2 Compiled by Engr. Ahmad Bilal

### Lab 5 RC Circuits. What You Need To Know: Physics 212 Lab

Lab 5 R ircuits What You Need To Know: The Physics In the previous two labs you ve dealt strictly with resistors. In today s lab you ll be using a new circuit element called a capacitor. A capacitor consists

### Chapter 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

### Circuits. 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

### WELCOME TO PERIOD 14. Homework Exercise #13 is due today. Watch video 3 Edison s Miracle of Light for class discussion next Tuesday or Wednesday.

WELCOME TO PERIOD 14 Homework Exercise #13 is due today. Watch video 3 Edison s Miracle of Light for class discussion next Tuesday or Wednesday. PHYSICS 1103 PERIOD 14 What is an electric circuit? How

### Capacitor Construction

Capacitor Construction Topics covered in this presentation: Capacitor Construction 1 of 13 Introduction to Capacitors A capacitor is a device that is able to store charge and acts like a temporary, rechargeable

### 2005 AP PHYSICS C: ELECTRICITY AND MAGNETISM FREE-RESPONSE QUESTIONS

2005 AP PHYSICS C: ELECTRICITY AND MAGNETISM In the circuit shown above, resistors 1 and 2 of resistance R 1 and R 2, respectively, and an inductor of inductance L are connected to a battery of emf e and

### AC 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

### UNIT G485 Module Capacitors PRACTICE QUESTIONS (4)

UNIT G485 Module 2 5.2.1 Capacitors PRACTICE QUESTIONS (4) 1 A 2200 µf capacitor is charged to a p.d. of 9.0 V and then discharged through a 100 kω resistor. (a) Calculate : (i) The initial charge stored

### The RC Circuit INTRODUCTION. Part 1: Capacitor Discharging Through a Resistor. Part 2: The Series RC Circuit and the Oscilloscope

The RC Circuit INTRODUCTION The goal in this lab is to observe the time-varying voltages in several simple circuits involving a capacitor and resistor. In the first part, you will use very simple tools

### Capacitance, 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

### = e = e 3 = = 4.98%

PHYS 212 Exam 2 - Practice Test - Solutions 1E In order to use the equation for discharging, we should consider the amount of charge remaining after three time constants, which would have to be q(t)/q0.

### 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

### Complete all the identification fields below or 10% of the lab value will be deduced from your final mark for this lab.

Simple circuits 3 hr Identification page Instructions: Print this page and the following ones before your lab session to prepare your lab report. Staple them together with your graphs at the end. If you

### 2. In words, what is electrical current? 3. Try measuring the current at various points of the circuit using an ammeter.

PS 12b Lab 1a Fun with Circuits Lab 1a Learning Goal: familiarize students with the concepts of current, voltage, and their measurement. Warm Up: A.) Given a light bulb, a battery, and single copper wire,

### Physics 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

### Louisiana 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),

### Lab 4. Series and Parallel Resistors

Lab 4. Series and Parallel Resistors Goals To understand the fundamental difference between resistors connected in series and in parallel. To calculate the voltages and currents in simple circuits involving

### PHYSICS 171 UNIVERSITY PHYSICS LAB II. Experiment 6. Transient Response of An RC Circuit

PHYSICS 171 UNIVERSITY PHYSICS LAB II Experiment 6 Transient Response of An RC Circuit Equipment: Supplies: Function Generator, Dual Trace Oscilloscope.002 Microfarad, 0.1 Microfarad capacitors; 1 Kilohm,

### Answer Key. Chapter 23. c. What is the current through each resistor?

Chapter 23. Three 2.0- resistors are connected in series to a 50.0- power source. a. What is the equivalent resistance of the circuit? R R R 2 R 3 2.0 2.0 2.0 36.0 b. What is the current in the circuit?