does not represent electrical power in a circuit

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Solution

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

1 $I^{2} R$

2 $I R^{2}$

3 VI

4 $V^{2} / R$

Ans.
(2)

We know that, P=VI…(i)

Where,
P = Power
V = Potential difference
I = Current
V = IR …(ii)

On substituting equation (ii) in equation (i), we get:

$P = I^{2} R \dots (i i i)$

Again, from Ohm's law:

$I = V / R \dots (i v)$

On substituting equation (iv) in equation (i), we get:

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

Hence, option (b) $I R^{2}$ does not represent power

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