First slide

Electrical power

Question

ln the circuit shown in fig. the total power drawn from the battery is

Moderate

A

12 w
B

20 W
C

24 W
D

28.8 W

Solution

The effective resistances of R of the circuit is given by
$R = 1 + 2 + 2 + [(2 \times 2) / (2 + 2)] = 6 Ω$
Power dissipated P $= \frac{V^{2}}{R} = \frac{12 \times 12}{6} = 24 W$

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