Various units of energy

There are five different units to express energy:

J or Joule

It is the SI unit.


It is the cgs unit.

calorie or cal

It is usually used for heat or thermal energy.


It is used for electrical energy. It is also called the commercial unit of electrical energy.


It is normally used in modern physics.

Relation between various units of energy:

1 J = 107 ergs

i cal = 4.186 J

1 kWhr = 3.6 x 10 6 J

1 eV = 1.6 x 10 -19 J

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