The commercial unit of electrical energy is kilowatt-hour (kWh), which is equal to
[amp_mcq option1=”$3.6 \times 10^6$ J” option2=”$3.6 \times 10^3$ J” option3=”$10^3$ J” option4=”1 J” correct=”option1″]
This question was previously asked in
UPSC NDA-2 – 2022
1 kilowatt (kW) = 1000 Watts (W)
1 hour (h) = 3600 seconds (s)
Energy (Joules) = Power (Watts) × Time (seconds)
1 kWh = 1 kW × 1 h = 1000 W × 3600 s = 3,600,000 Joules (J)
In scientific notation, this is $3.6 \times 10^6$ J.