Which one of the following is not the unit of energy?(a) Kilowatt (b) Kilowatt hour(c) Joule (d) Newton meter

To determine which one of the following is not the unit of energy, we need to understand the units mentioned.

(a) Kilowatt: Kilowatt (kW) is a unit of power, not energy. Power measures the rate at which energy is transferred or converted.

(b) Kilowatt hour: Kilowatt hour (kWh) is a unit of energy. It represents the amount of energy consumed or produced over a period of one hour at a rate of one kilowatt.

(c) Joule: Joule (J) is the SI unit of energy. It is defined as the amount of work done when a force of one newton is applied over a distance of one meter.

(d) Newton meter: Newton meter (Nm) is also a unit of energy, commonly known as a joule. It represents the work done when a force of one newton is applied over a distance of one meter.

Based on the above explanations, the unit of energy that is not mentioned correctly is (a) Kilowatt.