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# Series RC Circuit

In the circuit of figure above, a capacitor and a resistor are shown in series. The current is calculated

The reactive component of the circuit of figure above is capacitive, so the
current can be expected to lead the applied voltage by some angle. As shown
by the phasor calculation, the angle of lead is 53.1°. The phase
relation of applied voltage ** V** and the current is illustrated
in the figure below.

Calculating *V*_{R} and *V*_{C},

Applied voltage ** V** must be the phasor sum of

*V*_{R}and

*V*_{C}:

Plotting *V*_{R} and *V*_{C} on the
complex plane of figure above shows that *V*_{R} and
** I** are in phase, and that

**leads**

*I*

*V*_{C}by 90°.