# Which one of the following is not the unit of energy? A) Joule B) Kilo watt Hour C) Horse Power D) Calorie

By BYJU'S Exam Prep

Updated on: September 13th, 2023

Horse Power is not a unit of energy. Energy can be simply described as the ability to perform tasks. It can appear in several forms, including kinetic, potential, electrical, chemical, radioactive, thermal, etc. It falls within the categories of renewable and non-renewable energy. The SI unit of energy is the joule (J), which bears the name of James Prescott Joule and his studies on the mechanical equivalent of heat because energy is defined in terms of work. It’s interesting that James Prescott Joule, a British scientist whose work helped develop the idea of energy, had his name preserved as the name of this worldwide unit.

## What is Not a Unit of Energy?

A unit of power is horsepower. Some mistakenly think it’s an energy unit. The units determine the standard measure of these quantities in physics. Because energy is defined in terms of work, the SI unit of energy is the joule (J), which takes its name from James Prescott Joule and his research on the mechanical equivalent of heat. When we break down the unit into its most basic components, 1-N.m = 1 Joule. In CGS, energy is expressed in erg. The erg is the same as 10-7 J. An erg is the amount of labor performed across a one-dyne, one-centimeter distance. The Joule is also the MKS Unit of Energy. Energy is measured in the same units as work (As work and energy are the two sides of the same coin).

### Units of Energy:

There are typically several units used to measure energy, and several different things can precede energy units. Typical units include:

• British thermal unit (BTU).
• Kilowatt-hour (kWh).
• Calorie.
• Electron Volts (eV).
• Hartree (the atomic unit of energy).
• Rydberg units.
• Barrel of oil.

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