### Chapter 3: Electricity

Q
##### Electricity

Question:

Which of the following terms does not represent electrical power in a circuit?

(a) ${I^2}R$      (b) $I{R}^2$      (c) $VI$        (d) ${V^2}/{R}$

Electric power, $P = VI$ …..(1)

That is an option (c).

Now, according to Ohm’s law, $V = IR$ …..(2)

So, $P = IR \times I$

$P = I^2R$

That is an option (a).

Now, using equation (2)

$V = IR$

$I = \frac{V}{R}$

Putting this value in eq(1), we get

$P = V \times \frac{V}{R}$

$P = \frac{V^2}{R}$

That is an option (d)

So, the correct option is (b).

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