Name a device that helps to maintain a potential difference across a conductor.
(a) Name a device which helps to maintain potential difference across a conductor (say, a bulb). (b) If a potential difference of 10 V causes a current of 2 A to flow for 1 minute, how much energy is transferred?
(a) Name a device that helps to measure the potential difference across a conductor. (b) how much energy is transferred by a 12 V power supply to each coulomb of charge which it moves around a circuit?