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

Answer: (B)

IR2

Answer 2

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.