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or,
where
Hence in a pure capacitive circuit, v = V sin ωt and current
m
. Current leads the voltage by 90°.
is called the capacitive reactance of the capacitor.
To express in terms of RMS values,
We take
Figure 3.16 (a) Pure capacitive circuit; (b) wave shapes of voltage, current, and power; (c) phasor
diagram
Therefore,
