Which of the following is not equal to watt?

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(D) The unit of power is the watt $(W)$.Power is defined as the rate of doing work,so $P = \frac{W}{t}$,which gives the unit $	ext{Joule/second}$.Fro

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Ampere/volt

Vedclass · Answer

(D) The unit of power is the watt $(W)$.Power is defined as the rate of doing work,so $P = \frac{W}{t}$,which gives the unit $	ext{Joule/second}$.From the electrical power formula $P = VI$,the unit is $	ext{Ampere} 	imes 	ext{volt}$.Using Ohm's law $V = IR$,we can substitute $V$ to get $P = I(IR) = I^{2}R$,which gives the unit $	ext{Ampere}^{2} 	imes 	ext{ohm}$.However,$	ext{Ampere/volt}$ is the unit of conductance (Siemens),not power.Therefore,the correct option is $D$.

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