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State the Unit of Energy and Define It. - Physics

Short Note

State the unit of energy and define it.

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Solution

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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APPEARS IN

Selina Concise Physics Class 7 ICSE
Chapter 3 Energy
Short/Long Answer Questions | Q 2
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