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RLC Circuits and Resonance - Technical MCQs

Q1:

What is the current phase angle for a parallel RLC circuit when IL = 15.3 A, IC = 0.43 A, and IR = 3.5 A?

A 76.7 degrees

B –4.25 degrees

C 88.8 degrees

D –76.7 degrees

ANS:D - –76.7 degrees

In RLC circut phase angle depends upon values of Xc,XL.

When XL>Xc(which occurs at high frequencies), the phase angle is positive, signifying that the current lags behind the applied voltage. And if Xc>XL then circuit is capacitive so current leads voltage and angle will be negative.

In given question Ic<IL.

Ic=Vs/Xc,IL=Vs/XL so,

(Vs/Xc)<(Vs/XL).

or XL<Xc that's why ans is -76.