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4 Cards in this Set

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Tests for measuring how voltage changes as a capacitor discharges:

Use a high-resistance voltmeter connected in parallel with the capacitor. Keep the current constant by constantly adjusting a variable resistor. Use a stopwatch to measure the voltmeter reading at regular intervals or use a data logger. The graph produced will have a straight line whose gradient is equal to the capacitance of the capacitor.

Capactiance

The charge stored per unit pd.

Energy stored in a capacitor

1/2QV = 1/2CV^2 = 1/2 Q^2/C




1/2 of the energy supplied by the battery is stored in the capacitor, the other half is wasted due to resistance in the circuit.

Measuring the energy stored in a charged capacitor.

pass