First slide

Electrical power

Question

An ideal gas is contained in a thermally insulated and rigid container. The gas is heated through a resistance of $100 Ω$ by passing a current of 1 amp. The change in the internal energy of the gas after S min. will be

Easy

A

10 kJ
B

20 kJ
C

30 kJ
D

40 kJ

Solution

Here $∆ W = 0$ (volume is constant)
$\begin{array}{l} ∴ ΔU = ΔQ = I^{2} RΔt = (1)^{2} \times (1000) \times (5 \times 60) \\ = 30 kJ \end{array}$

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