Question

The commercial unit of power is

• A. $kW$
• B. $kWh$
• C. $horsepower$
• D. none of these

Answer 1

The correct option is A

$kW$

Explanation for correct option - (A) $kW$

The electric power of an electrical device is the rate at which it consumes electrical energy under the rated voltage.

The formula for power $P$ is

$P=\frac{E}{t}$

Where $E$ is the energy and $t$ is the time.

The commercial unit of energy $E$ is $kWh$ and the unit of time is $h$.

Substitute the units into the above formula.

$$\begin{gathered} unitofpower\left(P\right)=\frac{kWh}{h} \\ unitofpower\left(P\right)=kW \end{gathered}$$

Hence, the commercial unit of power is $kW$.

Explanation for incorrect options -

(B) $kWh$

It is the commercial unit of energy.

(C) $horsepower$

It is also a unit of power but it is not a commercial unit.

(D) none of these

Since option (A) is correct, this option is not correct.

Hence, option (A) is correct.