unit: electric circuits Calculate the power dissipation in each of the following cases: a) An electrical device operating at 220 V has a current of 15 A flowing through it. a) A current of 15 A flows through an electrical device operating at 220 V. b) A heating wire with a resistance of 100 has a current of current of 5 A. c) A light bulb operating at 110 V has a resistance of resistance of 1500