1 kilowatt hour (kWh) of energy = __________ joule.

Correct option is A

1kWh = Energy in kilowatts × Time in hours × 3600 seconds/hour Step-by-Step Conversion:
1kWh = 1000W × 3600s
1kWh = 1000 x 3600 = 3,600,000 J
1kWh = 3.6×10^6 J