Question

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

• A. I²R
• B. IR²
• C. VI
• D. \(\frac {V^2}{R}\)

Answer 1

The Correct Option is B

We know that electric power is given by \(P = VI\)       … (i)
So, the option (C) is correct.

According to Ohm’s law, \(V = IR\)         … (ii)
Now putting the value of \(V\) from (ii) in (i), we get
Power \(P = (IR) × I = I^2R\)
So, the option (A) is correct.

Now putting the value of \(I\) from (ii) in (i), we get
Power \(P = V(\frac VR) =\frac { V^2}{R}\)
So, the option (D) is correct.

Hence, the option (B) does not represent electrical power in a circuit.