First slide

Alternating Current and voltage

Question

In an A.C. circuit the current

Moderate

A

Always leads the voltage
B

Always lags behind the voltage
C

Is always in phase with the voltage
D

May lead or lag behind or be in phase with the voltage

Solution

In pure resistance circuit the current is in phase with voltage.
And in circuits of different combinations of R, L and C the current and voltage are in different phases of leading ahead or lagging behind depending on the values.

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