A circuit has a resistance of $12 \Omega$ and an impedance of $15 \Omega$. The power factor of the circuit…

A circuit has a resistance of $12 \Omega$ and an impedance of $15 \Omega$. The power factor of the circuit will be
  1. 0.8
  2. 0.4
  3. 1.25
  4. 0.125

Solution

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

Asked in: JEE Main 2005

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