from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A unit of energy, especially electrical energy, equal to the work done by one watt acting for one hour and equivalent to 3,600 joules.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A unit of electrical energy equal to the power of one watt in use for one hour; often used as a unit of electricity consumption
from The Century Dictionary and Cyclopedia
- n. The energy derived from an activity or power of one watt maintained for one hour: a practical unit of energy.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a unit of energy equal to the power of one watt operating for one hour
Sorry, no etymologies found.
It supports Wi-Fi, Bluetooth and aGPS and includes a built-in 25-watt-hour lithium battery.
For comparison, the iPad 2 has a 25 watt-hour battery; the 11in MacBook Air model has a 35Wh battery, going up to 40Wh in the 13in model.
In the past 10 years alone, the energy density of lithium-ion batteries has doubled, and the price per watt-hour has fallen by more than 80%.
It is expected that for every square meter of surface, the process could generate about 1 watt-hour per year.
A BTU, or British thermal unit, is a unit of energy equivalent to about one-third watt-hour of electric power.
In the inch-pounds unit system, a watt-hour is equivalent to 3.412 Btu.
The watt-hour It is not an SI unit, despite being based on the watt.
One watt-hour is the amount of electrical energy equivalent to a one-watt load drawing power for one hour.
The watt-hour (symbol W·h) is a unit of energy commonly used to measure electricity.
This may not be taken as an accurate figure, however, as the watt-hour capacity of a cell depends very largely, not only on the make of the cell, but on the rate of its discharge.