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  4. The impedance of a circuit consists of 3 Ω resistance and 4 Ω reactance. The power factor of the circuit is

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Q. The impedance of a circuit consists of $3 \, \Omega $ resistance and $4 \, \Omega $ reactance. The power factor of the circuit is

AMUAMU 2007

Solution:

We know that
$ \tan \phi =\frac{X}{R}=\frac{4}{3} $
Then, power factor $ =\cos \phi $
$ =\frac{3}{5} $
$ \Rightarrow $ $ \cos \phi =0.6 $

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