Watt – unit of power and heat flow, flow of sound energy, power, constant electric current, active, reactive and apparent power of alternating electric current of the radiation flux and energy flux of ionizing radiation in the International system of units (SI). Has the Russian designation VT international designation – W.
Other units of measurement
Watt – unit of power and heat flow, stream, sound of energy, power, constant electric current, active, reactive and apparent power of alternating electric current of the radiation flux and energy flux of ionizing radiation in the International system of units (SI), named after the Scottish-Irish inventor-mechanic, James watt (Watt), the Creator of universal steam engine.
Watt as the unit of measurement is the Russian designation VT international designation – W.
1 watt is defined as the power that in 1 second of time work is being performed in 1 Joule.
W = kg · m2 / S3 = j / s.
1 W = 1 kg · 1 m2 / 1 C3 = 1 j / 1 s
In the International system of units watt introduced by the decision of the XI General conference on weights and measures in 1960, simultaneously with the adoption of the SI as a whole. In accordance with the rules SI, and relating the derived units are named for scientists, the name of the unit “watt” is spelled with a lowercase letter, and its symbol is capitalized (W). Such writing of the designation is stored in the symbols for derived units formed by using the watt.
Watts measure power, the heat flux, the flow of sound energy, the power of a constant electric current, active, reactive and apparent power of alternating electric current, power of the radiation flux and energy flux of ionizing radiation.
There is also a similar about the name of a unit of kilowatt-hour (kWh), watt hour (W⋅h). It should also be taken into account that these are two different units of measure related to different physical quantities. In watts and kilowatts measure power – the rate of change (transmission, transformation, consumption) of energy. At the same time, watt hour (W⋅h) and kilowatt-hour (kWh) are the units of energy (work). Watt hour (W⋅h) and kilowatt hours (kWh) is the energy produced (transferred, transformed, consumed) over time. If the power unit is constant, then the product (transferred, transformed, consumed) by the device energy equal to the work output of a device at the time of operation of the device.
For example, if the light output of 100 watts working for 1 hour, it has consumed (incoming energy) and allocated in the form of light and heat (output power) 100 WH or 0.1 kWh. 40-watt light bulb will consume (allocate) the same amount of energy in 2.5 hours.
The same is true for the produced electricity. Thus, the capacity of the power plant is measured in kilowatts (megawatts), but the amount delivered to the consumer for some time of energy is equal to the product of the power plant at the time and is expressed in kilowatt-hours (megawatt-hours).
Through the basic and derived SI units the watt is expressed as follows:
W = kg · m2 / S3
W = j / s
W = H · m / s
W = V · A
W = A2 · Th
Watts = V2 / Ohms
where A is amperes, V – bolt, j – Joule, m = meter, N – Newton, Ohm – Ohm s – second W – watt, kg – kilogram.
1 W ≈ is 0.102 kgf·m/s
1 W ≈ 1,36⋅10-3 HP
1 W = 859,8452279 cal/h
1 metric horsepower = 735,49875 watts.
In the Russian Federation, the value of horsepower is set to 735,499 watts.
Multiple and sub-multiple units are formed using standard prefixes of the SI.
|101 W||decawatt||davt||daW||10-1 W||deciwatt||DVT||dW|
|102 W||hectowatt||GW||hW||10-2 W||centiwatt||SVT||cW|
|103 W||kilowatt||kW||kW||10-3 W||milliwatts||mW||mW|
|106 W||MW||MW||MW||10-6 W||microwatt||MCW||µW|
|109 W||gigawatts||GW||GW||10-9 W||NW||NVT||nW|
|1012 W||terawatts||TVT||TW||10-12 W||PW||HTP||pW|
|1015 W||petawatts||HTP||PW||10-15 W||femtowatt||MCA||fW|
|1018 W||exawatt||EVT||EW||10-18 W||attowatt||ed||aW|
|1021 W||zettawatt||Vecs||ZW||10-21 W||zeptowatt||vecs||zW|
|1024 W||yottawatt||IVT||YW||10-24 W||yoctowatt||IVT||yW|
Approximate transmitter power of a regular mobile phone is 1 watt.
Capacity passenger automobile with engine 80 horsepower is 6⋅104 watts.
On 1 m2 of the surface of the Earth decreases the flow of solar radiation with a capacity of 1,366 kW (average)
Based on the above average values of irradiance on the Earth’s surface, the total flux of solar radiation falling on Earth is about 174 PVT.
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