Which one of the following is NOT the unit of energy?

Energy is defined as the capacity to do work, and its standard SI unit is the Joule (J) [2]. One Joule is equivalent to a Newton-metre (N·m), representing the work done when a force of one Newton is applied over a distance of one metre [2]. Electrical energy is often measured in Watt-hours (W·h) or kilowatt-hours (kWh), where power (Watts) is multiplied by time (hours) [1]. In terms of base SI units, energy is expressed as kg·m²/s². Conversely, the unit kg·m/s² represents the Newton (N), which is the SI unit for force, not energy. Force is defined as mass multiplied by acceleration (kg × m/s²), whereas energy requires force to be multiplied by distance (kg·m/s² × m), resulting in the squared metre term found in Joules.

Sources

1. [2] https://sathee.iitk.ac.in/article/physics/unit-of-energy/
2. [1] Science , class X (NCERT 2025 ed.) > Chapter 11: Electricity > 11.8 ELECTRIC POWER > p. 191