The power dissipation is 20 W when a combination of three equal resistors in series is connected to a source. Calculate the power dissipation when the hree resistors are connected in parallel across the source.

Three equal resistors connected in series across a source of emf E dissipate total power of 90 watts. Find the total power dissipated if the same resistors are connected in parallel across the same source of emf.

prove that the power dissipated in on ideal resistor connected to an AC source is (V(eff))^2 / R