Question

i) A battery of emf 12 V and internal
resistance 3 ohm 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
b
battery when the circuit is closed.​

Answer 1

Answer:

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 2

Answer:

Resistance of resistor is 21 ohms

Explanation:

I = $\frac{E}{R+r}$

∴0.5 = 12/ 3+r

∴3+r = 12/ 0.5

∴3+r = 24

∴r = 24 - 3

∴r = 21 ohm