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

Size: px
Start display at page:

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

Transcription

1 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 to measure the voltage as a function of time: a multimeter and a stopwatch. Your lab write-up will deal primarily with data taken in this part. In the second part of the lab, you will use an oscilloscope, a much more sophisticated and powerful laboratory instrument, to observe time behavior of an RC circuit on a much faster timescale. Your observations in this part will be mostly qualitative, although you will be asked to make several rough measurements using the oscilloscope. Part 1: Capacitor Discharging Through a Resistor You will measure the voltage across a capacitor as a function of time as the capacitor discharges through a resistor. The simple circuit you will use is shown in Figure 1. The capacitor, C, is an electrolytic capacitor of approximately 1000 µf or 10 3 F, with a manufacturing tolerance of ±20%. The resistance of the resistor, R, is 100 kω (10 5 ohms), with a tolerance of ±5%. DMM represents the digital multimeter used to measure DC voltage across the capacitor. The idea is simple: by closing switch S, you will charge up the capacitor to approximately 10 volts using the adjustable power supply. The capacitor is connected in parallel with a resistor, so that when you open the switch the capacitor will begin discharging through the resistor. Using a stopwatch and multimeter, you will record the capacitor voltage every 20 seconds until the capacitor has almost completely discharged. The goal is to examine the exponential decay of this RC circuit. Figure 1 Part 2: The Series RC Circuit and the Oscilloscope We shall use the oscilloscope to study charging and discharging of a capacitor in a simple RC circuit similar to the one shown in Fig. 2. In place of the multimeter used in the first part of lab, the oscilloscope will be used to measure the voltage across the capacitor. More about the oscilloscope can be found in Reference: The Oscilloscope /oscilloscope/manual.html c 2011 Advanced Instructional Systems, Inc. and the University of North Carolina 1

2 Figure 2 Assume the capacitor has zero charge on its plates and the switch is then put in position 1 as shown. This puts the resistor and capacitor in series with the power supply. Current flows and the capacitor charges up. How does the magnitude of the resistance affect the speed of charging? If R is small, then when the switch is initially switched to position 1, current will flow easily and the charge Q on the capacitor will build up quickly. Simultaneously, the potential difference across the capacitor increases until it equals the potential difference applied to the circuit from the power supply, V emf. Current will then no longer flow. If on the other hand, R is large, then a smaller current flows initially and it takes a longer time for the capacitor to charge. Figure 3: A Charging Capacitor It can be shown theoretically that the voltage across the charging capacitor in the circuit described above is the following. V C = V emf (1 e t/rc ) (1) This discussion is correct only for the charging of the capacitor. What happens if the switch is now moved to position 2? This takes the power supply out of the circuit. The capacitor now c 2011 Advanced Instructional Systems, Inc. and the University of North Carolina 2

3 discharges through the resistor until there is no potential difference between the plates. This is the same situation you studied in Part 1. The voltage across the discharging capacitor is given by the following. V C = V emf e t/rc (2) The product RC is called the time constant. With the switch in position 2, V R = V C. Later, at t = RC, the voltage across the resistor V R = V emf e 1 = V emf. After this time, the potential difference across the resistor has been reduced to about 37% of its initial value, V emf. You will observe the potential difference across the capacitor as a function of time for a circuit containing a charging and discharging capacitor. Using this data and equation above, you can estimate the value of the product RC and compare this value with the known value of RC. Why find the time constant? The time constant is a characteristic of all exponential curves and tells us, in a single number, how fast or slow the curve is rising or decaying. For any exponential function, knowing the time constant tells us how long it takes for that function to fall to 1/e, or 37%, of its initial value for a decay; or how long it will take for a rising exponential function to reach (1 1/e), or 63% of its final value. For example, under ideal conditions, the number of bacteria in a culture grows exponentially, and the growth can be described by an exponential equation: N (t) = N 0 e kt, where N 0 is the number of bacteria initially present, N (t) is the number present some time t later, and k is the time constant, indicating how fast the culture will grow. PROCEDURE Part 1: Capacitor Discharging Through a Resistor 1 Fully discharge your capacitor. Measure the capacitance of your capacitor using the capacitance meter provided by your instructor. Note the accuracy rating for the capacitance meter you used (see Appendix - Instrument Accuracy 2 ), and use this to estimate the uncertainty of your reading. Measure also the resistance of the resistor using the multimeter, and look up the accuracy of the meter for the range you used. 2 Again, make sure the capacitor is fully discharged. Assemble the circuit shown in Fig. 1 using banana plug cables. NOTE THE CAPACITOR HAS + AND LEADS. Be sure the + end is connected to the positive (RED) connector on the power supply and the end is connected to the negative (BLACK) connector. CAUTION: THE CAPACITOR WILL EXPLODE IF LEFT CONNECTED BACKWARDS TO THE POWER SUPPLY. 3 Turn on the digital multimeter and set the selector switch to measure DC voltage. Locate the 2../instrument/manual.html c 2011 Advanced Instructional Systems, Inc. and the University of North Carolina 3

4 Data Hold button on the meter, labeled either DATA-H or DATA HOLD. When this button is pushed once, the meter display freezes to display the voltage present when the button was pushed. A DH symbol will appear in the display. Pushing the Data Hold button again releases the display to show the current circuit voltage. 4 Turn on the power supply with the control knob fully counterclockwise (zero). Close the switch. Turn the power supply control knob clockwise until the voltage across the capacitor and resistor is approximately 10 volts, as indicated on the multimeter. 5 When the control knob is set where you want it, measure the charged capacitor voltage. Record this value as your starting voltage, V 0, for time t = 0. 6 One lab partner should be ready to write down the voltages called out by the other partner, who will be watching a stopwatch and taking voltage readings. When you re ready to begin, simultaneously open the switch and begin timing. 7 At successive intervals of 20 seconds (20 s, 40 s, 60 s, etc.), push the Data Hold button to read the voltage. Record each voltage, V C, and time, t. Push the button again to release the display and be ready for your next reading. Continue taking readings until at least five minutes (300 seconds) have elapsed. 8 Take two additional readings at one minute intervals, e.g. at 6 minutes and 7 minutes. By now the capacitor voltage should be nearly zero. Part 2: The Series RC Circuit and the Oscilloscope In this experiment, a function (or signal) generator shown in Figure 4 will replace the switch and power supply shown in Figure 2. This is only a minor difference, and one that you don t need to worry too much about. In essence, the function generator has the effect of opening and closing the switch many times every second in a regular and repeatable way. This allows us to use an oscilloscope to measure the time dependence of the voltage. 1 Measure and record the resistance (R = 5.6 kω, nominal value) of the resistor with the multimeter and the capacitance (C = 1 nf, nominal value) of the capacitor with the capacitance meter provided. The accuracy of the capacitance meter is listed in the Appendix 3. 2 Connect the function generator, capacitor, resistor, and oscilloscope O as shown in Figure 4. Connect the leads from the oscilloscope so that they are measuring the potential difference across the capacitor. Note connections for the positive and negative leads. 3../instrument/manual.html Figure 4 c 2011 Advanced Instructional Systems, Inc. and the University of North Carolina 4

5 3 Set all the controls on the scope as instructed in the oscilloscope exercises in Reference: The Oscilloscope 4. Set the sweep rate to 50 µs/div. Set the frequency on the signal generator to about 8 khz and make sure it is set to produce square waves. 4 Turn on the scope and the function generator. Increase the amplitude on the function generator to about half of the maximum. Adjust the gain (volts/div) and the sweep (time/div) knobs on the scope until you see a trace that looks something like Fig. 3. It may be necessary to fine-tune the trigger level setting to get a clear display. Be sure that you can see the point corresponding to t = 0. Adjust the vertical shift knob on the scope and the amplitude knob on the function generator until the maximum and minimum voltage levels of the trace are aligned with the top and bottom horizontal grid lines (graticules) on the screen. Shift the horizontal position of the trace until the beginning of the charging or discharging curve lines up with a vertical graticule. This alignment with the grid lines makes it much easier to read measurements from the scope. Have your instructor check your display before you go further. 5 Using the beginning of the decay as the t = 0 point, measure the amount of time it takes for the capacitor voltage to decay to 37% (e 1 ) of its maximum value at t = 0. Alternatively, you could measure the time it takes for the capacitor to charge to 63% of its maximum value. Either measurement gives the RC time constant for the circuit. If your scope s sweep function has a magnification switch (10x), you may be able to obtain a more precise measurement by expanding part of the trace to fill more of the screen. 6 Temporarily turn off the function generator and remove the 5600-ohm resistor from your circuit. Replace it with a resistor substitution box set to approximately 5600 ohms. Turn the function generator back on and again observe the trace on the oscilloscope. Now change the resistance value and observe how the charging/discharging curve changes. Qualitatively note what happens when you make R much larger or smaller than the original value of 5600 ohms. Be sure that you and your T.A. initial your data sheet. ANALYSIS 1 Make a plot of ln(v C /V 0 ) vs. t from the data obtained in Part 1. Enter your time data in units of seconds. 2 The equation for the capacitor voltage as a function of time is given as V C = V 0 e t/rc. Make a least-squares linear fit of your plot of ln(v C /V 0 ) vs. t. Identify the parameters used in the fit to the equation for the exponential decay of the capacitor voltage. DISCUSSION For both parts of the experiment, compare the value of the time constant obtained to the predicted value, computed from the known values of R and C. Is the agreement to within the accuracy of the value for RC measured using the capacitance and multimeter? 4../oscilloscope/manual.html c 2011 Advanced Instructional Systems, Inc. and the University of North Carolina 5

### 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.

### 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.)

### 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,

### 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

### 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 =.

### (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

### 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

### 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

### Exercise 1: Capacitors

Capacitance AC 1 Fundamentals Exercise 1: Capacitors EXERCISE OBJECTIVE When you have completed this exercise, you will be able to describe the effect a capacitor has on dc and ac circuits by using measured

### 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

### 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 =.

### Lab 6: Capacitors and Resistor-Capacitor Circuits Phy208 Spr 2008 Name Section

: Capacitors and Resistor-Capacitor Circuits Phy208 Spr 2008 Name Section Your TA will use this sheet to score your lab. It is to be turned in at the end of lab. You must use complete sentences and clearly

### 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:

### 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

### Capacitance Measurement

Overview The goal of this two-week laboratory is to develop a procedure to accurately measure a capacitance. In the first lab session, you will explore methods to measure capacitance, and their uncertainties.

### 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

### Chapter 6. Answers to examination-style questions. Answers Marks Examiner s tips

(a) Taking natural logs on both sides of V = V o e t/c gives ln V = ln V o + ln (e t/cr ) As ln (e t/cr ) = t CR then ln V = ln V o t CR = a bt hence a = ln V o and b = CR (b) (i) t/s 20 240 270 300 mean.427.233.033

### 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;

### 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

### ( ) ( ) = q o. T 12 = τ ln 2. RC Circuits. 1 e t τ. q t

Objectives: To explore the charging and discharging cycles of RC circuits with differing amounts of resistance and/or capacitance.. Reading: Resnick, Halliday & Walker, 8th Ed. Section. 27-9 Apparatus:

### Lab 5 AC Concepts and Measurements II: Capacitors and RC Time-Constant

EE110 Laboratory Introduction to Engineering & Laboratory Experience Lab 5 AC Concepts and Measurements II: Capacitors and RC Time-Constant Capacitors Capacitors are devices that can store electric charge

### Prepare for this experiment!

Notes on Experiment #8 Theorems of Linear Networks Prepare for this experiment! If you prepare, you can finish in 90 minutes. If you do not prepare, you will not finish even half of this experiment. So,

### 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

### RC Circuits. 1. Designing a time delay circuit. Introduction. In this lab you will explore RC circuits. Introduction

Name Date Time to Complete h m Partner Course/ Section / Grade RC Circuits Introduction In this lab you will explore RC circuits. 1. Designing a time delay circuit Introduction You will begin your exploration

### 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

### resistance in the circuit. When voltage and current values are known, apply Ohm s law to determine circuit resistance. R = E/I ( )

DC Fundamentals Ohm s Law Exercise 1: Ohm s Law Circuit Resistance EXERCISE OBJECTIVE When you have completed this exercise, you will be able to determine resistance by using Ohm s law. You will verify

### 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

### Prepare for this experiment!

Notes on Experiment #8 Theorems of Linear Networks Prepare for this experiment! If you prepare, you can finish in 90 minutes. If you do not prepare, you will not finish even half of this experiment. So,

### Experiment Guide for RC Circuits

Guide-P1 Experiment Guide for RC Circuits I. Introduction 1. Capacitors A capacitor is a passive electronic component that stores energy in the form of an electrostatic field. The unit of capacitance is

### Class #12: Experiment The Exponential Function in Circuits, Pt 1

Class #12: Experiment The Exponential Function in Circuits, Pt 1 Purpose: The objective of this experiment is to begin to become familiar with the properties and uses of the exponential function in circuits

### Capacitor investigations

Sensors: Loggers: Voltage Any EASYSENSE Capacitor investigations Logging time: EasyLog (20 s) Teacher s notes 01 Time constant for a capacitor - resistor circuit Theory The charging and discharging of

### ECE 241L Fundamentals of Electrical Engineering. Experiment 5 Transient Response

ECE 241L Fundamentals of Electrical Engineering Experiment 5 Transient Response NAME PARTNER A. Objectives: I. Learn how to use the function generator and oscilloscope II. Measure step response of RC and

### 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.

### Exercise 1: RC Time Constants

Exercise 1: RC EXERCISE OBJECTIVE When you have completed this exercise, you will be able to determine the time constant of an RC circuit by using calculated and measured values. You will verify your results

### 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

### RC Studies Relaxation Oscillator

RC Studies Relaxation Oscillator Introduction A glass tube containing neon gas will give off its characteristic light when the voltage across the tube exceeds a certain value. The value corresponds to

### Electronics Capacitors

Electronics Capacitors Wilfrid Laurier University October 9, 2015 Capacitor an electronic device which consists of two conductive plates separated by an insulator Capacitor an electronic device which consists

### College Physics II Lab 8: RC Circuits

INTODUTION ollege Physics II Lab 8: ircuits Peter olnick with Taner Edis Spring 2019 Introduction onsider the circuit shown. (onsult section 23.7 in your textbook.) If left for long enough, the charge

### Lab 3 - Capacitors. Stony Brook Physics Laboratory Manuals. Equipment

3/20/2017 Lab 3 Capacitors [Stony Brook Physics Laboratory Manuals] Stony Brook Physics Laboratory Manuals Lab 3 - Capacitors In this experiment we will determine the capacitance of an unknown capacitor

### Physics 208 Fall 2008 Lab 4: Electric Fields and Electric Potentials

Name Section Physics 208 Fall 2008 Lab 4: Electric Fields and Electric Potentials Your TA will use this sheet to score your lab. It is to be turned in at the end of lab. You must use complete sentences

### PROBLEMS FOR EXPERIMENT ES: ESTIMATING A SECOND Solutions

Massachusetts Institute of Technology Physics Department 801X Fall 2002 PROBLEMS FOR EXPERIMENT ES: ESTIMATING A SECOND Solutions Problem 1: Use your calculator or your favorite software program to compute

### 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

### July 11, Capacitor CBL 23. Name Date: Partners: CAPACITORS. TI-83 calculator with unit-tounit. Resistor (about 100 kω) Wavetek multimeter

July 11, 2008 - CBL 23 Name Date: Partners: CAPACITORS Materials: CBL unit TI-83 calculator with unit-tounit link cable Resistor (about 100 kω) Connecting wires Wavetek multimeter TI voltage probe Assorted

### 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 Class Date. RC Circuit Lab

RC Circuit Lab Objectives: Students will be able to Use the ScienceWorkshop interface to investigate the relationship between the voltage remaining across a capacitor and the time taken for the discharge

### RC Circuit Lab - Discovery PSI Physics Capacitors and Resistors

1 RC Circuit Lab - Discovery PSI Physics Capacitors and Resistors Name Date Period Purpose The purpose of this lab will be to determine how capacitors behave in R-C circuits. The manner in which capacitors

### Exercise 1: Thermistor Characteristics

Exercise 1: Thermistor Characteristics EXERCISE OBJECTIVE When you have completed this exercise, you will be able to describe and demonstrate the characteristics of thermistors. DISCUSSION A thermistor

### 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

### Herefordshire College of Technology Center Number Student:

Herefordshire College of Technology Center Number 024150 Course: : BTEC Level 3 Subsidiary Diploma in Engineering / Diploma in Electrical/Electronic Engineering Student: Unit/s: 6 Electrical & Electronic

### 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

### Laboratory Manual. Physics 166, 167, 168, 169. Lab manual, part 2 For PHY 167 and 169 students

Laboratory Manual Physics 166, 167, 168, 169 Lab manual, part 2 For PHY 167 and 169 students Department of Physics and Astronomy HERBERT LEHMAN COLLEGE Spring 2018 TABLE OF CONTENTS Writing a laboratory

### EXPERIMENT 07 TO STUDY DC RC CIRCUIT AND TRANSIENT PHENOMENA

EXPERIMENT 07 TO STUDY DC RC CIRCUIT AND TRANSIENT PHENOMENA DISCUSSION The capacitor is a element which stores electric energy by charging the charge on it. Bear in mind that the charge on a capacitor

### The Digital Multimeter (DMM)

The Digital Multimeter (DMM) Since Physics 152 covers electricity and magnetism, the analysis of both DC and AC circuits is required. In the lab, you will need to measure resistance, potential (voltage),

### 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

### Phys1220 Lab Electrical potential and field lines

Phys1220 Lab Electrical potential and field lines Purpose of the experiment: To explore the relationship between electrical potential (a scalar quantity) and electric fields (a vector quantity). Background:

### ECE 220 Laboratory 4 Volt Meter, Comparators, and Timer

ECE 220 Laboratory 4 Volt Meter, Comparators, and Timer Michael W. Marcellin Please follow all rules, procedures and report requirements as described at the beginning of the document entitled ECE 220 Laboratory

### 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

### 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

### Laboratory #1: Inductive and Capacitive Transients Electrical and Computer Engineering EE University of Saskatchewan

Authors: Denard Lynch Date: July, 16, 2012 Corrections: Sep 16, 2012 D. Lynch, M. R. Avendi Revised: Sep 22, 2012 D. Lynch Revised: Sep 9, 2013 Description: This laboratory exercise explores resistance

### 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.

### 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

### 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

### Electric Fields and Potentials

Electric Fields and Potentials INTRODUCTION Physicists use the concept of a field to explain the interaction of particles or bodies through space, i.e., the action-at-a-distance force between two bodies

### Coupled Electrical Oscillators Physics Advanced Physics Lab - Summer 2018 Don Heiman, Northeastern University, 5/24/2018

Coupled Electrical Oscillators Physics 3600 - Advanced Physics Lab - Summer 08 Don Heiman, Northeastern University, 5/4/08 I. INTRODUCTION The objectives of this experiment are: () explore the properties

### 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

### 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.

### 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

### Old Dominion University Physics 112N/227N/232N Lab Manual, 13 th Edition

RC Circuits Experiment PH06_Todd OBJECTIVE To investigate how the voltage across a capacitor varies as it charges. To find the capacitive time constant. EQUIPMENT NEEDED Computer: Personal Computer with

### 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

### RC, RL, and LCR Circuits

RC, RL, and LCR Circuits EK307 Lab Note: This is a two week lab. Most students complete part A in week one and part B in week two. Introduction: Inductors and capacitors are energy storage devices. They

### 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.

### 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

### 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

### Solutions to these tests are available online in some places (but not all explanations are good)...

The Physics GRE Sample test put out by ETS https://www.ets.org/s/gre/pdf/practice_book_physics.pdf OSU physics website has lots of tips, and 4 additional tests http://www.physics.ohiostate.edu/undergrad/ugs_gre.php

### Equipotential and Electric Field Mapping

Experiment 2 Equipotential and Electric Field Mapping 2.1 Objectives 1. Determine the lines of constant electric potential for two simple configurations of oppositely charged conductors. 2. Determine the

### Kirchhoff s Rules and RC Circuits

PHYSICS II LAB 5 SP212 Kirchhoff s Rules and RC Circuits Pages 10 11 are Appendixes added for extra information. Pages 1 9 only are the Lab instructions. I. Introduction A. Today s Lab will investigate

### 1) Two lightbulbs, one rated 30 W at 120 V and another rated 40 W at 120 V, are arranged in two different circuits.

1) Two lightbulbs, one rated 30 W at 120 V and another rated 40 W at 120 V, are arranged in two different circuits. a. The two bulbs are first connected in parallel to a 120 V source. i. Determine the

### Lab 3: Electric Field Mapping Lab

Lab 3: Electric Field Mapping Lab Last updated 9/14/06 Lab Type: Cookbook/Quantitative Concepts Electrostatic Fields Equi-potentials Objectives Our goal in this exercise is to map the electrostatic equi-potential

### 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

### OBJECTIVE: To understand the relation between electric fields and electric potential, and how conducting objects can influence electric fields.

Name Section Question Sheet for Laboratory 4: EC-2: Electric Fields and Potentials OBJECTIVE: To understand the relation between electric fields and electric potential, and how conducting objects can influence

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

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

### 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

### 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

### 3.14 mv ma. Objectives. Overview

Phys 3 Lab 7 Ch 0 Simple DC and RC Circuits Equipment: power supply, banana cables, circuit board, switch, 0, 70, 460, & 30, k,two multi-meters, differential voltage probe, Phys 3 experiment kits: batteries

### Experiment 5: Measurements Magnetic Fields

Experiment 5: Measurements Magnetic Fields Introduction In this laboratory you will use fundamental electromagnetic Equations and principles to measure the magnetic fields of two magnets. 1 Physics 1.1

### 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

### P202 Practice Exam 2 Spring 2004 Instructor: Prof. Sinova

P202 Practice Exam 2 Spring 2004 Instructor: Prof. Sinova Name: Date: (5)1. How many electrons flow through a battery that delivers a current of 3.0 A for 12 s? A) 4 B) 36 C) 4.8 10 15 D) 6.4 10 18 E)

### 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

### PHYS 1102 EXAM - II. SECTION: (Circle one) 001 (TH 9:30 AM to 10:45AM) 002 (TH 3:30 PM to 4:45 PM) You have 1 hr 45 minutes to complete the test

PHYS 1102 EXAM - II SECTION: (Circle one) 001 (TH 9:30 AM to 10:45AM) 002 (TH 3:30 PM to 4:45 PM) Your Name: Student ID: You have 1 hr 45 minutes to complete the test PLEASE DO NOT START TILL YOU ARE INSTRUCTED

### Electrical Circuits Lab Series RC Circuit Phasor Diagram

Electrical Circuits Lab. 0903219 Series RC Circuit Phasor Diagram - Simple steps to draw phasor diagram of a series RC circuit without memorizing: * Start with the quantity (voltage or current) that is

### IMPORTANT Read these directions carefully:

Physics 208: Electricity and Magnetism Common Exam 2, October 17 th 2016 Print your name neatly: First name: Last name: Sign your name: Please fill in your Student ID number (UIN): _ - - Your classroom

### Experiment ES Estimating a Second

Introduction: About Estimating Experiment ES Estimating a Second Before measuring and calculating comes estimation; a chance to exercise ingenuity. Often it's a matter of organizing your rough knowledge

### Equipotential and Electric Field Mapping

Experiment 1 Equipotential and Electric Field Mapping 1.1 Objectives 1. Determine the lines of constant electric potential for two simple configurations of oppositely charged conductors. 2. Determine the

### RLC Circuits. 1 Introduction. 1.1 Undriven Systems. 1.2 Driven Systems

RLC Circuits Equipment: Capstone, 850 interface, RLC circuit board, 4 leads (91 cm), 3 voltage sensors, Fluke mulitmeter, and BNC connector on one end and banana plugs on the other Reading: Review AC circuits

### Demonstration of Chaos

revised 4/21/03 Demonstration of Chaos Advanced Laboratory, Physics 407 University of Wisconsin Madison, Wisconsin 53706 Abstract A simple resonant inductor-resistor-diode series circuit can be used to

### 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

### 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

### Multi-loop Circuits and Kirchoff's Rules

1 of 8 01/21/2013 12:50 PM Multi-loop Circuits and Kirchoff's Rules 7-13-99 Before talking about what a multi-loop circuit is, it is helpful to define two terms, junction and branch. A junction is a point

### 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

### 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

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