# Lab report -The RC Time Constant

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### Question Description

check the attachment it has all you need to do the lab report

Lab Report Guidelines

# Complete the

prelab

and

all questions

associated with each lab

(found in the questions section)

.

# Reports are due at the start of class the following week

.

ONLY PAPER COPIES WILL BE ACCEPTED

# Include the following

sections in your lab report write

-

up:

1.

Title page

-

Include title of lab, name, date

etc.

2.

Objectives

-

Can be bulleted

list.

3.

Equipment

Include list of all items used. Also in include sketch of apparatus, photograph is

OK.

4.

Introduction/Theory

Describe th

e underlying physics of the lab and any background

information.

5.

Equations

List all equations in your calculations. Be sure to define all variable and include

units.

Number each equation and refer to it in the text.

6.

Procedure

Sequential list of the

steps you took to complete the

lab.

7.

Results

Include any plots, tables etc. For plots, be sure all numbers and axes are easy to

. Label axes including

units.

8.

Discussion/Conclusion

Summarize your results. If an unexpected result was observed, what

w

ent wrong?

Describe possible sources of error/uncertainty.

Include how you would improve

the

experiment

if you were to repeat it

.

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yourBestTutor5
School: Cornell University

Attached.

The RC time constant
Objectives

Study the time it takes for a capacitor to discharge over a resistor.
Determine the RC time constant in a circuit by measuring how the voltage across the capacitor
changes in time.
Calculate the unknown values for a capacitor’s capacitance and a resistor’s resistance.

Equipment list

DC power supply;
Voltmeter with a known resistance;
Capacitor;
Laboratory timer;
Resistor with an unknown resistance;
Single-pole (double-throw) switch;

Theory
A capacitor is known to be an electronic component which stores
electrical energy in the electric field which is created between its parallel
plates. Consider the circuit shown in figure 1 consisting of a power supply of
E, a resistor R and a capacitor C. When connected to a power supply, the
capacitor begins to store the charge that flows in the circuit, until it reaches
its maximum ability and then there is no current flowing in the circuit. This
ability of the capacitor to store electrical energy is characterized by
capacitance.
When the power supply is taken out of the picture, the capacitor takes its
place. It begins to discharge current in the circuit through the resistance
until it runs out of electrical energy.

Figure 1: a simple circuit
consisting of a power supply,
a resistor and a capacitor.

The quantity RC is referred to as the time co...

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