Watt-hour (Wh)
The watt-hour is a unit of energy, used for battery capacity ratings, small device energy consumption. Its symbol is Wh.
Wh
kWh
1 watt-hour equals
| Kilowatt-hours | 0.001 kWh |
| Kilocalories | 0.860421 kcal |
| Joules | 3,600 J |
| British Thermal Units | 3.41214 BTU |
About the watt-hour
The watt-hour emerged with the electric utility industry in the 1880s, when companies needed a practical way to bill customers for electrical energy.
In everyday use the watt-hour appears in battery capacity ratings, small device energy consumption. As a point of reference: a smartphone battery stores about 15 Wh.