Q. Which term in the following does not denote the electric power in electric circuit?
a) VI
b) IR^2
c) I^2R
d) V^2/R
Correct Answer : b) IR^2
Question from BPSC PT 71, 2025
Correct Answer: b) IR^2
Explanation:
– Electric power is given by P = VI.
– Using Ohm’s law (V = IR) for a resistive circuit:
– P = VI = (IR)·I = I^2R
– Also, P = VI = V·(V/R) = V^2/R
– Thus, VI, I^2R, and V^2/R are valid power expressions.
– IR^2 = I·R^2 is not a power expression; its units are A·Ω^2 = V^2/A, which are not watts (V·A). Hence, it does not denote electric power.
