Question

A 24 volt battery of internal resistance of 4Ω is connected to a variable resistance. The rate of heat production in the resistor is maximum when current in the circuit is

• A. 2 A
• B. 3 A
• C. 4 A
• D. 6 A

Answer 1

Answer: (B)

3 A

Answer 2

When R = r (power dissipated is maximum)

∴ R = 4Ω

I = $\frac{V}{R_{net}}$= $\frac{24}{8}$= 3 A