Commercial unit of energy is kilowatt hour (kWh).
The SI unit of energy is joule.
1 kWh = 3.6x {tex} ${{10}^{6}}$J{/tex}
(ii) Given, P = 2500 W, t = 4 h
E = P/T = 2500/ 1000 x 4 = 10 kwH = 10 units.

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