watt-hour

And by covering the fibres with carbon nanotubes, at least 20 watt-hours per kilogram is expected by the end of next year.

Not much, admittedly, when compared to the 128 watt-hours per kilogram of a lithium-ion battery, like that found in many electric cars.

Pure electrics will probably displayjust the watt-hours per mile and perhaps some variation of the utility factor.

In the early 1990s, such batteries had an energy density of about 100 watt-hours per litre.

For the BEV it is the amount of Watt hours that can be delivered per unit of weight, volume, or cost.

A lot more might then choose to do so than ifleft to deal with unfamiliar watt-hours rather than friendly old miles pergallon.

The lowest amount of solar energy the rover is expected to receive is about 275 watt-hours per sol.

Finally, a fully enclosed battery pack provides between 16. 5 and 22 watt-hours of operation (depending upon cell technology).

According to the San Francisco Business Times, three hours of dancing on the special floor would produce 1, 440 watt-hours of power.

The result is a material that has an energy density of about 0. 005 watt-hours per kilogram.

Each 12-by-12-foot Solar Roadway panel would produce about 7, 600 watt-hours a day, based on an average of four hours of sunlight.

So, if a Nissan Leafuses, say, 300 watt-hours to travel a mile, then its equivalent fuel economy inpetrol terms would be 112mpg.