Also see energy, joule, International System of Units (SI), and Table of Physical Units.
POWER ON TIME GENERATOR
If this energy is used to operate an electric generator, the output of the generator over a certain period of time can be expressed in watt-hours.Ĭompare kilowatt-hour. The heat energy resulting from combustion of such fuels is usually expressed in joules according to the International System of Units (SI) or in British thermal units ( Btu) according to the foot-pound-second (fps) or English system. A quantity of gasoline, oil, or coal contains potential energy that is liberated when the fuel is burned. The watt-hour is rarely used to express energy in any form other than electrical. If P and t are not specified in watts and hours respectively, then they must be converted to those units before determining E in watt-hours.
Then P = 60 and t = 3, so the energy E in watt-hours is: To determine E in watt-hours, P must be expressed in watts and t must be expressed in hours. In general, energy ( E) is equivalent to power ( P) multiplied by time ( t). To obtain watt-hours when joules are known, multiply by 2.778 x 10 -4. To obtain joules when watt-hours are known, multiply by 3.600 x 10 3. There are third party indicators (Tray Status) but they just indicate.
You would need to listen to determine if spinning. Suspend will turn off a hard drive and some (but not all) hard drives will spin down. The watt-hour is not a standard unit in any formal system, but it is commonly used in electrical applications.Īn energy expenditure of 1 Wh represents 3600 joules (3.600 x 10 3 J). Unless power on is affected by disk errors, power on time does not predict lifespan in any way. The watt-hour (symbolized Wh) is a unit of energy equivalent to one watt (1 W) of power expended for one hour (1 h) of time.
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