The amount of energy stored in a capacitor, is expressed in joules and is
given by:
W =
V2CV
2
Capacitors in d.c. circuits
A capacitor connected across a d.c. supply is shown in Diagram 31a.
The curves of the current and voltage in the circuit are shown in Diagram
31b.
As the capacitor begins to charge, its voltage increases until it is
equal to the supply voltage. At the same time the charging
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