First slide

Electrical power

Question

In the given circuit, maximum power which can be delivered safely to any resistor is 24 W. Maximum potential difference that can be applied between X and Y, so that all resistances are safe, is :

Moderate

A

36 V
B

32 V
C

24 V
D

12 V

Solution

$∵ P = \frac{V^{2}}{R} ∵ V = \sqrt{RP} \Rightarrow V \propto \sqrt{R}$
Which is minimum across 6 $Ω$ so maximum PD applied between X and Y is 12 + 12 = 24 volt

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