SSC JE Electrical Engineering 2014 Set 2 Paper

Question : 110 of 200

Marks: +1, -0

The power factor of an a.c. circuit is given by :

Solution:

Power factor is a Ratio of Actual electric Power dissipated by an AC circuit to the Product o the RMS volue of current and voltage

cosϕ={{I^2}_{\rms}R}/{V_{\rms}I_{\rms}}

={{I^2}_{\rms}R}/{I_{\rms}.2.I_{\rms}}=R/2

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