Which of the following is not equal to watt? (a) joule/second (b) ampere x volt (c) (ampere)2 x ohm (d)ampere/volt​

 One Watt of power is equal to one Joule of energy consumed in one second. The Watt can also be used in order to quantify the rate at which energy is transferred. The SI unit of power is named after the Scottish inventor and chemist James Watt.

We know that the unit of power is watt, and it is also represented as:

Watt=Joule/second

Also, watt = Ampere × volt

And watt = Ampere × Ohm

So, option D is not the unit of power, i.e. watt.