question_answer

A circuit has a resistance of\[12\,\Omega \]and an impedance of\[15\,\Omega \]. The power factor of the circuit will be                          [AIEEE 2005]

A) 0.8

B) 0.4    

C) 1.25

D) 0.125

Correct Answer: A

Solution :

[a] Power factor \[=\cos \phi =\frac{R}{Z}\,=\frac{\text{Resistance}}{\text{Impedance}}\]