1 kilowatt-hour (kWh) is equal to 3.6 million joules (3.6 × 10^6 J) of energy. This means it is the amount of energy delivered by one kilowatt (1000 watts) of power sustained for one hour (3600 seconds).

Explanation

• A kilowatt-hour is a unit of energy, commonly used for electrical energy.
• It is defined as one kilowatt of power used for one hour.
• Since 1 watt = 1 joule/second, multiplying 1000 watts by 3600 seconds gives:

1kWh=1000 W×3600 s=3,600,000 J=3.6×106 J1\text{kWh}=1000,\text{W}\times 3600,\text{s}=3,600,000,\text{J}=3.6\times 10^6,\text{J}1kWh=1000W×3600s=3,600,000J=3.6×106J

Other equivalences

• 1 kWh = 3.6 megajoules (MJ)
• 1 kWh = 1000 watt-hours (Wh).

Thus, 1 kWh is a measure of energy equivalent to 3.6 million joules.