Question

A battery of emf 12 V and internal
resistance 3 ohms is connected to a resistor.
If the current in the circuit is 0.5 A,
a] Calculate resistance of resistor.
b] Calculate terminal voltage of the
battery when the circuit is closed.
[Ans: a) 21ohms, b) 10.5 V]​

Answer 1

Answer:

Vt = 10.5 v & R = 21 ohm

Explanation:

E = 12 v

r = 3 ohm

I = 0.5 A

Vt = E - Ir

Vt = 12 - 0.5x3

Vt = 10.5 v

Vt = IR

R = Vt / I

R = 10.5 / 0.5

R = 21 ohm