a. Define the term capacitance of a capacitor.
b. This is a circuit that can be used to measure the capacitance of a capacitor.

The reed switch vibrates back and forth at a frequency of 50 Hz. Each time it makes contact with A, the capacitor is charged by the battery so that there is a p.d. of 12 V across it. Each time it makes contact with B, it is fully discharged through the resistor.
i. Calculate the charge that is stored on the capacitor when there is a p.d. of 12 V across it.
ii. Calculate the average current in the resistor.
iii. Calculate the average power dissipated in the resistor.
c. A second capacitor of the same value is connected in series with the first capacitor.
Discuss the effect on both the current recorded and the power dissipated in the resistor.

Transcribed Image Text:

reed switch A 12 V I 67 µF (mA Figure 23.24