Page 310 - Basic Electrical Engineering

Exapmle 3.8 An alternating voltage of RMS value 100 V, 50 Hz is applied
separately across a resistance of 10 Ω, an inductor of 100 mH, and a capacitor
of 100 μF. Calculate the current flow in each case. Also draw and explain the

phasor diagrams.

Solution:

Current through R,

Current through L,

Current through C,

We know that in a resistive circuit current is in phase with the applied

voltage; in a purely inductive circuit current lags the voltage by 90°; and in a
purely capacitive circuit current leads the voltage by 90°. The phasor

diagrams have been shown in Fig. 3.17.