(a) Define the term Volt’.
(b) State the relation between work, charge and potential difference for an electric circuit. Calculate the potential difference between the two terminals of a battery if 100 of work is required to transfer 20 coulombs of charge from one terminal of the battery to the other.
a) Volt: Volt is the unit of potential difference between two points. If 1 joule work is done to move 1 coulomb positive charge from one point to another, then the potential difference between the points is 1 volt.
IV = 1JC-1
One volt is also defined as the potential difference across a resistance of 1 Ohm when 1 ampere of current flows through it.
(b) The relation between work (W), charge (Q) and potential difference (V): The work required to be done (W) to move a positive charge Q, between two points in a circuit having potential difference V, is QV. That is, W = QV
Therefore, the potential difference between the two terminals of a battery is 5V.