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DC meters often measured charge in ampere hours. Since the voltage of the supply should remain substantially constant, the reading of the meter was proportional to actual energy consumed. For example, if a meter recorded that 100 ampere hours had been consumed on a 200-volt supply, then 20 kilowatt-hours of energy had been supplied. A 'Reason ...
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-watt bulb for 2.5 hours, or a 50-watt bulb for 2 hours.
A kilowatt-hour (unit symbol: kW⋅h or kW h; commonly written as kWh) is a non-SI unit of energy equal to 3.6 megajoules (MJ) in SI units, which is the energy delivered by one kilowatt of power for one hour. Kilowatt-hours are a common billing unit for electrical energy supplied by electric utilities.
100 100 Lifespan (hours) 50,000 15,000 20,000 10,000 25,000 10,000 1,000 1,000 Bulb lifetime (years) @ 6 hours/day: 22.8 6.8 9.1 4.6 11.4 4.6 0.46 0.46 Energy cost over 20 years @ 16.1 cents/kWh [96] $28 $46 $63 $60 $67 $99 $303 $423 Cost of bulbs over 20 years $7 $10 $5 $13 $8 $8 $51 $18 Total cost over 20 years $35 $56 $69 $73 $75 $106 $355 $441
The power setting displays instantaneous power, and the kilowatt-hour setting displays energy consumed since last reset. When electricity is disconnected, the P4400's measurements and meters are reset. [6] To reset Kill A Watt models that store values, press Volt and Amp together, or press the Reset key in some models.
kilo-(kW) 1–3 × 10 3 W tech: heat output of a domestic electric kettle: 1.1 × 10 3 W tech: power of a microwave oven: 1.366 × 10 3 W astro: power per square meter received from the Sun at the Earth's orbit: 1.5 × 10 3 W tech: legal limit of power output of an amateur radio station in the United States up to 2 × 10 3 W