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What is Energy ?

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The energy of a body is defined as its capacity for doing work. 

(1) It is a scalar quantity. 

(2) Dimension : [ML2T2] it is same as that of work or torque. 

(3) Units : Joule [S.I.], erg [C.G.S.] Practical units : electron volt (eV), Kilowatt hour (KWh), Calories (Cal) 

Relation between different units :

1 Joule = 107 erg 

1 eV = 1.6 × 10–19 Joule 

1 KWh = 3.6 × 106 Joule 

1 Calorie = 4.18 Joule

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