First slide

Electrical power

Question

In the circuit shown power dissipated in R just after S is closed is P₁ and a long time after S is closed power dissipated in R is P₂. Then

Moderate

A

P₁ = P₂
B

P₁ > P₂
C

P₁ < P₂
D

Sufficient

Solution

Power dissipated $= \frac{V^{2}}{R}$
As current flows through the resistor, its resistance increases due to increase in temperature as a result power dissipated in the resistor decreases. There fore P₂ > P_1.

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