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⇤ ← Revision 1 as of 2008-06-20 20:26:38
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Charging and Discharging Capacitors 5C30.30
Parts for this demonstration are found in the Electrostatics Cabinet, A4
A 9V battery is used to charge a capacitor. The brightness of a light bulb tracks the flow of current. When a switch is thrown, the capacitor discharges through another light bulb.
The demonstration should be stored with the switch closed so that the battery is open-circuited and the capacitor is close-circuited through the light bulb.
Discussion: the time is takes a bulb to dim is the characteristic time (RC time) of the circuit in which it is placed.