Question

what is a potential difference between the terminals of battery is 250 joules of work is required to transfer 20 coulomb of charge from one terminal of the battery to the other

Answer 1

Let the potential difference be V.

Charge that is transferred (q) = 20 Coulombs

Electrical potential energy required (E) = 250 joules

Now, the relation between energy, potential difference and charge transferred is:

E = q × V

$V = \frac{E}{q}$

$V = \frac{250 }{20}$

V = 12.5 Volts

Hence, the potential difference between the terminals of the battery is 12.5 V