Question:
the power factor of a series L-C-R circuit when at resonance is
the power factor of a series L-C-R circuit when at resonance is
Updated On: Aug 1, 2022
- zero
- 0.5
- 1
- depends on values of L, C and R
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The Correct Option is C
Solution and Explanation
Average power of circuit is given by
$P=E_{ rms } \times i_{ rms } \times \cos \phi$
In a series LCR circuit at resonance voltage and current being in same phase, therefore $\phi=0$.
Hence, power factor $=\cos \phi=\cos 0^{\circ}=1$
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Concepts Used:
LCR Circuit
An LCR circuit, also known as a resonant circuit, or an RLC circuit, is an electrical circuit consist of an inductor (L), capacitor (C) and resistor (R) connected in series or parallel.
Series LCR circuit
When a constant voltage source is connected across a resistor a current is induced in it. This current has a unique direction and flows from the negative to positive terminal. Magnitude of current remains constant.
Alternating current is the current if the direction of current through this resistor changes periodically. An AC generator or AC dynamo can be used as AC voltage source.
