The energy of a body is defined as its capacity for doing work.
(1) Since energy of a body is the total quantity of work done, therefore it is a scalar quantity.
(2) Dimension : [ML2T-2] it is same as that of work or torque.
(3) Units : joule [S.I.], erg [C.G.S.]
Practucal units : electron colt (eV), Kilowatt hour (KWh), Calories (cal)