Question

Three 2 V cells are connected in series and used as a battery in a circuit.
(a) What is the p.d. at the terminals of the battery?
(b) How many joules of electrical energy does 1 C gain on passing through (i) one cell (ii) all three cells?

Answer 1

a) The potential difference across each battery is 2V and the potential difference across terminal is 3 x 2 V = 6V.

b)

$V=\frac{W}{Q}$

i) The potential difference across one cell is 2V

$2=\frac{W}{1}$

W = 2J

ii) The potential difference across three cells is 6 V

$6=\frac{W}{1}$

W = 6 J