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1 W = 1J/s
or 1 Ws = 1J

1kW.h = 1000 W×3600 s = 3600000 Ws = 3.6×10⁶ Ws = 3.6×10⁶J
Work = force x displacement Si unit of work is joule and 1 joule = 1N x 1M And energy is the capability of doing work Extra unit of energy is 1kwh and 1kwh = 1kw x 1h = 1000w x 3600 sec = 3.6 x 10 to the power6