Question 2:

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

(a) I²R

(b) IR²

(c) VI

(d) V²/R

Answer:

(b) Electrical power is given by the expression, P = VI … (i)

According to Ohm’s law, V = IR … (ii)

Where,

V = Potential difference

I = Current

R = Resistance

∴ P = VI

From equation (i), it can be written

P = (IR) × I

∴ P = I²R

From equation (ii), it can be written

Power P cannot be expressed as IR².

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