the unit for consumption of energy
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kilo watt hour
kwh
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The kilowatt-hour (symbolized kWh) is a unit of energy equivalent to one kilowatt (1 kW) of power expended for one hour (1 h) of time. The kilowatt-hour is not a standard unit in any formal system, but it is commonly used in electrical applications.
- An energy expenditure of 1 kWh represents 3,600,000 joules (3.600 x 106 J). To obtain joules when kilowatt-hours are known, multiply by 3.600 x 106. To obtain kilowatt-hours when joules are known, multiply by 2.778 x 10-7.
In general, energy (E) is equivalent to power (P) multiplied by time (t). To determine E in kilowatt-hours, P must be expressed in kilowatts and t must be expressed in hours.
- Suppose a 1.5-kW electric heater runs for 3 h. Then P = 1.5 and t = 3, so the energy E in kilowatt-hours is:
→ E = Pt = 1.5 x 3 = 4.5 kWh
If P and t are not specified in kilowatts and hours respectively, then they must be converted to those units before determining E in kilowatt-hours.
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