JEE MAIN - Physics (2005 - No. 18)
A circuit has a resistance of $$12$$ $$ohm$$ and an impedance of $$15$$ $$ohm$$. The power factor of the circuit will be
$$0.4$$
$$0.8$$
$$0.125$$
$$1.25$$
Paliwanag
Power factor $$ = \cos \phi = {R \over Z} = {{12} \over {15}} = {4 \over 5} = 0.8$$