Convert joule to watt hour
Enter the value to convert from joule to watt hour.
How to Convert Joule to Watt hour
Converting joule to watt hour is straightforward using our conversion calculator.
Conversion Formula
Wh = J ÷ 3600Reverse conversion: Convert watt hour to joule
Comparison: Joule vs Watt-hour
When to Use Each Unit
Joule: Universal scientific unit for all forms of energy: mechanical, electrical, thermal, chemical, and nuclear energy worldwide.
Watt-hour: Used for small device energy consumption, battery ratings, and low-power electrical measurements.
Common Conversion Values
- 1000 J = 1 kJ
- 1 J ≈ 0.239 cal
- 3,600,000 J = 1 kWh
- 1 J ≈ 0.738 ft⋅lbf
About Joule
Definition: The joule (symbol: J) is the SI unit of energy, equal to the energy expended when applying one newton of force through one meter of distance.
History: Named after English physicist James Prescott Joule in 1889. Established the mechanical equivalent of heat and energy conservation.
Current Use: Universal scientific unit for all forms of energy: mechanical, electrical, thermal, chemical, and nuclear energy worldwide.
Examples: Apple: 350,000 J, car battery: 4.3 MJ, lightning bolt: 1-5 billion J, human daily intake: 8-10 MJ
About Watt
Definition: The watt hour (symbol: Wh) is the energy consumed by using one watt of power for one hour.
History: Smaller electrical energy unit for measuring low-power device consumption and battery capacity.
Current Use: Used for small device energy consumption, battery ratings, and low-power electrical measurements.
Examples: Smartphone battery: 15 Wh, laptop battery: 50-100 Wh, tablet: 25-40 Wh, LED bulb hour: 10 Wh