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  4. A 24 V battery of internal resistance 4 Ω is connected to a variable resistance. If the rate of heat production in the resistor is maximum, then the current in the circuit is

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Q. A $24 \, V$ battery of internal resistance $4 \, \Omega $ is connected to a variable resistance. If the rate of heat production in the resistor is maximum, then the current in the circuit is

NTA AbhyasNTA Abhyas 2020Current Electricity

Solution:

When $R=r$ (power dissipated is maximum)
Solution
$\therefore \, R=4\Omega $
$\therefore I=\frac{V}{R_{n e t}}= \, \frac{24}{8}= \, 3 \, A$