The commercial unit of electrical energy is kilowatt hour (kWh) and 1 kWh is equal to __________.
\(3.6 \times 10^{6}\) watt second
1 kilowatt hour means power of 1000 watts used for 1 hour, and 1 hour equals 3600 seconds.
So, \(1\ \text{kWh} = 1000 \times 3600 = 3.6 \times 10^{6}\) watt second.
Hence, 1 kWh is equal to \(3.6 \times 10^{6}\) watt second.
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