The H amount of thermal energy is developed by a resistor in 10 s when a current of 4 A is passed through it. If the current is increased to 16 A, the thermal energy developed by the resistor in 10 s will be:
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Question

The H amount of thermal energy is developed by a resistor in 10 s when a current of 4 A is passed through it. If the current is increased to 16 A, the thermal energy developed by the resistor in 10 s will be:

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G1 Physics · Accepted Answer

For a fixed resistor and time, heat H = I²Rt, so H ∝ I². Increasing current from 4 A to 16 A multiplies current by 4, hence heat by 16.