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A capacitor is a device that can store charge and release all of it very quickly into a circuit. It
is used in devices like a flash in a camera to release a large charge for a bright flash when only
needed for a short time, a battery simply…

Page 2

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When a capacitor is charging;
Charge flows from the battery to the capacitor
o Voltage Increases
o There is a current
Until the capacitor voltage is equal to the battery voltage
As more charge is stored it becomes harder to push more charge on so the current
o Current…

Page 3

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When a capacitor discharges the voltage, current and stored charge all fall; following an
exponential decay. The time constant () is the time taken for the charge, current or voltage
to fall to 0.368 of its original value. Why this number? It's e-1 . Why is it e-1 ?



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