Power is defined as the rate of doing work. The commercial unit of electrical energy is kW h and the SI unit is joule. .

Given P = 1.5 kW,

t = 2 hours,

E = P x t = ?

E = 1.5 x 2 = 3 kW h

Given P = 1.5 kW,

t = 2 hours,

E = P x t = ?

E = 1.5 x 2 = 3 kW h