First slide

Phasors and Phasor Diagrams

Question

In a circuit, the current lags behind the voltage by a phase difference of $π / 2 .$ The circuit will contain which of the following?

Easy

A

only R
B

only L
C

R and C
D

only C

Solution

When a circuit contains inductance only, then the current lags behind the voltage by the phase difference of $π / 2 or 90^{\circ} .$
While in a purely capacitive circuit, the current leads the voltage by a phase angle of $π / 2 or 90^{\circ} .$
In a purely resistive circuit, current is in phase with the applied voltage.

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