First slide

Electrical power

Question

The current in C is 2 A. The rate of heat loss in A, B and c are 1.20, 0.60 and 1.20 J/s, respectively. The emf of the cell [for cell internal resistance - 0] is

Moderate

A

3 V
B

1.5 V
C

3.6 V
D

none of these

Solution

Power = EI
$\Rightarrow 1 .20 + 0 .60 + 1 .20 = E \times 2 \Rightarrow E = 1 .5 V$

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