Name a device that helps to measure the potential difference across a conductor. b) How much energy is transferred by a 12V power supply to each coulomb of charge which it moves around a circuit?

1. Voltmeter

1. Given,

Potential difference = 12V Charge moved = 1C

Work done = ?

We know that the work done is given as:

Work done = Potential difference × Charge moved

= 12 × 1 = 12 Joules

Therefore, 12J work is done on a 1C charge.