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RLC Circuits and Resonance

Q1: What would be the power factor for an RLC circuit that acts inductively?

A +90 degrees leading

B one

C zero

D –90 degrees lagging

ANS:A - +90 degrees leading

The power factor can vary between definite limits, being 1 (unity) for purely resistive circuits, where the phase angle is 0° and P = UI; or 0 for purely reactive (inductive or capacitance) circuits, where the phase angle is 90° and P = 0.

purely inductive circuit it required more reactive power, therefore, power comes zero.
Power factor=true power/apparent power.
Apparent power=true power+ reactive power.
So, the power factor is inversely propositional to reactive power.



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