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JIPMER 2014

Exam: JIPMER
Year: 2014
Subject: Physics
Chapter: Alternating Current

JIPMER 2014 · Physics · Alternating Current

Real power consumption in a circuit is least when it contains.

Real power consumption in a circuit is least when it contains.

Options

Ahigh $R$ , low $L$
Bhigh $R$ , high $L$
Clow $R$ , high $L$
Dhigh $R$ , low $C$

Correct answer

C. low $R$ , high $L$

Step-by-step solution

Power consumption

=I_{\text{rms }} V_{\mathrm{rms}} \cos \phi

where,

\cos \phi

is power factor.

\cos \phi=\frac{R}{Z}

For

\cos \phi

to be minimum,

R

should be minimum and

Z

should be higher. So, higher

Z

(impedance),

L

(inductance) should be high.

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