State the unit of energy and define it.

1.	State the unit of energy and define it.
Answer» The energy is measured in the same unit as work. Therefore the S.I. unit of energy is joule (symbol J). A body is said to possess an energy of one joule if a force of 1 newton moves the body by a distance of 1 metre in the direction of force. Another unit of energy is calorie (symbol cal) where 1 cal = 4.2 J. A bigger unit is kilo-calorie (symbol kcal) where 1 kcal = 1000 cal.

Answer»

The energy is measured in the same unit as work. Therefore the S.I. unit of energy is joule (symbol J).

A body is said to possess an energy of one joule if a force of 1 newton moves the body by a distance of 1 metre in the direction of force.

Another unit of energy is calorie (symbol cal) where 1 cal = 4.2 J. A bigger unit is kilo-calorie (symbol kcal) where 1 kcal = 1000 cal.

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