Understanding watt-hours will help you survive power outages and off-grid adventures.

The watt reigns supreme, if only companies would share it with us. Every time I see “mAh” on a consumer product, I cringe.

The conversion to kWh is take the watt consumption per hour, divide it by 1,000 ... According to the energy use chart, a laptop computer typically uses 50 watts and will cost less than a penny ...

text{power (kilowatt, kW)}\times{\text{time (hour, h)}}\) Note that power is measured in kilowatts here, instead of the more usual watts. To convert from W to kW you must divide by 1,000.