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  4. A circuit has a resistance of 12 ohm and an impedance of 15 ohm. The power factor of the circuit will be

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Q. A circuit has a resistance of $12$ ohm and an impedance of $15$ ohm. The power factor of the circuit will be

Alternating Current

Solution:

Power factor $= cos \,\phi = \frac{R}{Z} $
$= \frac{12}{15} = \frac{4}{5} = 0.8$