Question

A cell of e.m.f. 12 volts and internal resistance 5 Ω is connected with a resistance. If the current flowing in the circuit be 0.3A, then what will be the resistance of the resistor and terminal voltage of the cell in closed circuit?

Answer 1

Given : E = 12 volt; r = 5Ω, i = 0.3

A, R = ?; V = ?

Terminal voltage of the cell in closed circuit,

V = E - ir = 12 - 0.3 x 5

= 12 - 1.5

= 10.5 volt