If a unit of power and time are not specified in watts and number of hours, respectively, then they must be converted to those units before determining energy in watt-hours.

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The watt-hour is most often used to express electrical energy in any form. A quantity of gasoline, oil or coal contains potential energy that is liberated when the fuel is burned.

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Market segmentation is a marketing strategy that uses well-defined criteria to divide a brand's total addressable market share ...

Energy (E) is equivalent to power (P) multiplied by time (t). To determine energy in watt-hours, power must be expressed in watts, and time must be expressed in hours. Suppose a 60 watt light bulb burns for 3 hours. Then P = 60 and t = 3, so the total energy E in watt-hours is:

Watt-hours help people understand the amount of power available in various items, such as batteries. Watts represent the amount of energy flowing in a circuit and are computed using this formula:

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Although the chairman is ostensibly in charge, his secretary makes all the decisions and is the real power behind the throne.

A MAC address (media access control address) is a 12-digit hexadecimal number assigned to each device connected to the network.

Watt-hours are used to measure battery capacity and battery life, estimate number of times the battery can recharge a device and provide a metric for comparing battery performance. Watt-hours are also used as a measure of how much energy a solar panel can produce.

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The watt-hour, which is symbolized Wh, is a unit of energy equivalent to one watt of power expended for one hour of time. The watt-hour is not a standard unit in any formal system, but it is commonly used in electrical applications.

An energy expenditure of 1 Wh represents 3,600 joules or 3.600 x 103 J. To obtain joules when the watt-hours are known, multiply the number of watt-hours by 3.600 x 103. To obtain watt-hours when joules are known, multiply the number of joules by 2.778 x 10-4.

Much of that growth is being powered by online sales, and a lot of the advertising promoting those products has been concentrated in affiliate spending.

A kilowatt-hour is another important energy metric that assumes the generation of 1,000 watts for one hour. Dividing the number of watt-hours by 1,000 results in the equivalent kilowatt-hours as shown in the following equation:

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The heat energy resulting from combustion of such fuels is usually expressed in joules according to the International System of Units or in British thermal units according to the foot-pound-second or English system. If this energy is used to operate an electricity generator, the output of the generator over a period of time can be expressed in watt-hours.

Watt-hours can be used to determine the energy usage of various electrical devices, such as standard light bulbs, over time. Knowing the potential electrical power use of a device also provides insight into when it might need to be replaced. This information is also useful for determining if a device would benefit from being replaced with a more energy efficient version that will help users cut energy consumption and electricity bills and increase energy efficiency.

For this use of the voice in the special service of will-power, or propelling force, it is necessary first to test its freedom.

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Speed and distance are also useful analogies to wattage and watt-hours. For example, an automobile may run at 60 miles per hour. That's analogous to watts, in that the car's speed at any moment is 60 mph. If the car travels at 60 mph for one hour, it travels 60 miles in distance. This is analogous to watt-hours.

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Watt-hours are useful in a different way. With a battery that displays its ratings as 10 amp hours (Ah) operating at 12 volts, multiplying the battery voltage by the amp hour rating provides the watt-hours of the battery as shown in the following equation:

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Kilowatt-hour is an important metric for measuring performance of high-capacity power systems, such as uninterruptible power systems and diesel generators.

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Watts describe the level of power at a moment in time, whereas watt-hours describe the amount of power consumption over a period of time.

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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Power supplies and energy use are important parts of designing a data center. Learn more about how to design and build a data center.