First slide

Electrical power

Question

If power dissipated in the 9 $Ω$ resistor in the circuit shown is 36 watt, the potential difference across the 2 $Ω$ resistor, is :

Easy

A

4 volt
B

8 volt
C

10 volt
D

2 volt

Solution

Given circuits can be reduced to

$P_{1} = \frac{3^{2}}{1} = 9 W P_{2} = \frac{3^{2}}{1 / 2} = 18 W P_{3} = \frac{3^{2}}{2} = 4.5 W$

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