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Power is the rate at which energy is generated or consumed and hence is measured in units (e.g. watts) that represent energy per unit time. For example, when a light bulb with a power rating of 100 W is turned on for one hour, the energy used is 100 watt hours (W·h), 0.1 kilowatt hour, or 360 kJ. This same amount of energy would light a 40 ...
Performance per watt also typically does not include full life-cycle costs. Since computer manufacturing is energy intensive, and computers often have a relatively short lifespan, energy and materials involved in production, distribution, disposal and recycling often make up significant portions of their cost, energy use, and environmental impact.
The watt, kilogram, joule, and the second are part of the International System of Units (SI). The hour is not, though it is accepted for use with the SI. Since a watt equals one joule per second and because one hour equals 3600 seconds, one watt-hour per kilogram can be expressed in SI units as 3600 joules per kilogram.
The wattmeter is an instrument for measuring the electric active power (or the average of the rate of flow of electrical energy) in watts of any given circuit. Electromagnetic wattmeters are used for measurement of utility frequency and audio frequency power; other types are required for radio frequency measurements.
Download as PDF; Printable version; ... Those 2,000 watts can be reduced by controlling the size and performance ... To calculate G/Wh, take the gallons per hour (GPH ...
Power density, defined as the amount of power (the time rate of energy transfer) per unit volume, is a critical parameter used across a spectrum of scientific and engineering disciplines. This metric, typically denoted in watts per cubic meter (W/m 3 ), serves as a fundamental measure for evaluating the efficacy and capability of various ...
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geo: average power consumption per person worldwide in 2008 (21,283 kWh/year) 3.3–6.6 × 10 3 W eco: average photosynthetic power output per square kilometer of ocean [23] 3.6 × 10 3 W tech: synchrotron radiation power lost per ring in the Large Hadron Collider at 7000 GeV [6] 10 4: 1–5 × 10 4 W tech: nominal power of clear channel AM [24 ...