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Capacitance Measurements

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Topics

Points of Emphasis

Prerequisites

Lab Activities

Using an electrometer, the students:

1. experimentally confirm the equivalent capacitance relationships for series and parallel capacitance circuits;

2. experimentally confirm the theoretically predicted equivalent capacitance for two combination circuits;

3. experimentally measure the capacitance of an unknown capacitor using two methods -- charge sharing and voltage ratio;

4. experimentally measure the capacitance of an unknown capacitor with a capacitance much less than the standard using the repeated charge sharing method; and

5. experimentally confirm the capacitance relationships in a homework problem given in the writeup.

Quantitative experimental results tend to be within 10% of the expected values.

Course Level

Introductory: P4, P14, P16

Student Handouts

Equipment

Number of set-ups available: 10

Per lab station:

1 electrometer
1 0-5 V power supply
1 red peg board
3 white conducting strips
4 banana leads
2 alligator clips
1 standard capacitor
2 unknown capacitors
1 .01 µfarad capacitor
1 .02 µfarad capacitor
1 .03 µfarad capacitor
1 .05 µfarad capacitor

Charges apparatus

Notes


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