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Common Benchmarks
Phone battery
40 kJ
Laptop full charge
200 kJ
Boil 1 liter water
334 kJ
100 W bulb for 1 hour
0.1 kWh
Match stick
1 kJ
Gasoline liter
34 MJ
Frequently Asked Questions
How much is 3 joules in kilowatt-hours?
3 joules is about 0.00000083 kilowatt-hours.
What is a joule?
A joule is a unit of energy.
What is a kilowatt-hour?
A kilowatt-hour is a unit of energy.
When are joules used?
It is used when working with energy measurements.
When are kilowatt-hours used?
It is used when working with energy measurements.
Why do some conversions produce very small or very large numbers?
The result can look tiny or huge because the units are meant for very different scales. A joule is used for everyday scales, while a kilowatt-hour is used for much larger scales. That’s why 1 kilowatt-hour equals 3,600,000 joules.