Digital panel meter
analogue panel meter water meters
Watt
From gissowatt watt panel meter
The watt (symbol: W) is the SI derived unit of power, equal to one joule of
energy per second. It measures a rate of energy use or production.
A human climbing a flight of stairs is doing work at a rate of about 200 watts.
A typical automobile engine produces mechanical energy at a rate of 25,000 watts
(approximately 33.5 horsepower) while cruising. A typical household incandescent
light bulb uses electrical energy at a rate of 25 to 100 watts, while compact
fluorescent lights typically consume 5 to 30 watts.
Contents
1 Definition
2 Origin and adoption as an SI unit
3 Derived and qualified units for power distribution
3.1 Kilowatt
3.2 Megawatt
3.3 Gigawatt
3.4 Terawatt
3.5 Electrical and thermal
4 Confusion of watts and watt-hours
5 See also
6 References
7 External links
gissowatt watt panel meter Definition
.
In electrical terms, it follows that:
Or, in terms of volts and amperes:
That is, if 1 volt of potential difference is applied to a resistive load, and a
current of 1 ampere flows, then 1 watt of power is dissipated.[1] More simply
stated: watts is equal to amps times volts.
Note that the electrical definitions are true instantaneously, and for DC
voltage and current. The Volt-ampere article explains the consequences when the
RMS voltage and current are measured separately.
gissowatt watt panel meter Origin and adoption as an SI unit
The watt is named after James Watt for his contributions to the development of
the steam engine, and was adopted by the Second Congress of the British
Association for the Advancement of Science in 1889 and by the 11th General
Conference on Weights and Measures in 1960 as the unit of power incorporated in
the International System of Units (or "SI").
This SI unit is named after James Watt. As with every SI unit whose name is
derived from the proper name of a person, the first letter of its symbol is
uppercase (W). When an SI unit is spelled out in English, it should always begin
with a lowercase letter (watt), except where any word would be capitalized, such
as at the beginning of a sentence or in capitalized material such as a title.
Note that "degree Celsius" conforms to this rule because the "d" is lowercase.
— Based on The International System of Units, section 5.2.
>
gissowatt watt panel meter Derived and qualified units for power distribution
gissowatt watt panel meter Kilowatt
The kilowatt (symbol: kW), equal to one thousand watts, is typically used to
state the power output of engines and the power consumption of tools and
machines. A kilowatt is roughly equivalent to 1.34 horsepower. An electric
heater with one heating-element might use 1 kilowatt.
gissowatt watt panel meter Megawatt
The megawatt (symbol: MW) is equal to one million (106) watts.
Many things can sustain the transfer or consumption of energy on this scale;
some of these events or entities include: lightning strikes, large electric
motors, naval craft (such as aircraft carriers and submarines), engineering
hardware, and some scientific research equipment (such as the supercollider and
large lasers). A large residential or retail building may consume several
megawatts in electric power and heating energy.
The productive capacity of electrical generators operated by utility companies
is often measured in MW. Modern high-powered diesel-electric railroad
locomotives typically have a peak power output of 3 to 5 MW, whereas U.S.
nuclear power plants have net summer capacities between about 500 and 1300
MW.[2]
According to the Oxford English Dictionary, the earliest citing for "megawatt"
is a reference in the 1900 Webster's International Dictionary of English
Language. The OED also says "megawatt" appeared in a 28 November 1847, article
in Science (506:2).
gissowatt watt panel meter Gigawatt
The gigawatt (symbol: GW) is equal to one billion (109) watts. This unit is
sometimes used with large power plants or power grids.
gissowatt watt panel meter Terawatt
The terawatt (symbol: TW) is equal to one trillion (1012) watts. The average
energy usage of the earth (about 15 TW) is commonly measured in these units. The
most powerful lasers from the mid 1960s to the mid 1990s produced power in
terawatts, but only for nanoseconds.
gissowatt watt panel meter Electrical and thermal
Megawatt electrical (abbreviation: MWe[citation needed] or MWe[3]) is a term
that refers to electric power, while megawatt thermal (abbreviations: MWt, MWth,
MWt, or MWth) refers to thermal power produced. Though 'megawatt electrical' and
'megawatt thermal' are not SI units,[4] alternative SI prefixes are sometimes
used, for example gigawatt electrical (GWe). The International Bureau of Weights
and Measures states that unit symbols should not use subscripts to provide
additional information about the quantity being measured, and regards these
symbols as incorrect.[5]
These terms are used by engineers to disambiguate the electric output of a
thermal power station versus the (larger) thermal output. For example, the
Embalse nuclear power plant in Argentina uses a fission reactor to generate 2109
MWt of heat, which creates steam to drive a turbine, which generates 648 MWe of
electricity. The difference is heat lost to the surroundings.
>
gissowatt watt panel meter Confusion of watts and watt-hours
Power and energy are frequently confused in the general media. A watt is one 1
joule of energy per second. So watts multiplied by a period of time equals
energy. For example, if a 100 watt light bulb is turned on for one hour, then an
amount of energy is used corresponding to 100 watts of power being generated for
a time period of one hour, i.e. 100 watts times one hour, i.e. 0.1
kilowatt-hour.
Since a joule as a quantity of energy does not have a readily imagined size to
the layperson, the non-SI unit watt-hour, often in its multiples such the
kilowatt-hour or higher prefixes, is frequently used as a unit of energy,
especially by energy-supply companies (electricity and natural gas suppliers),
which often quote charges by the kilowatt-hour. A kilowatt-hour is the amount of
energy equivalent to a power of 1 kilowatt running for 1 hour:
(1 kW·h)(1000 W/kW)(3600 s/h) = 3,600,000 W·s = 3,600,000 J = 3.6 MJ.
gissowatt watt panel meter See also
Energy Portal
Volt-ampere
Conversion of units
James Watt
Declared net capacity (power plants)
Orders of magnitude (power)
Power factor
Root mean square (RMS)
Watt balance
Watt-hour
Wattmeter
>
a1villas.co.uk 13a.co.uk a1 cd.co.uk a1guns.co.uk a1solar.co.uk a1webcam.co.uk airpistol.co.uk allwinds.co.uk austin-7-bits.co.uk austin7bits.co.uk basic-nutrition.co.uk basicnutrition.co.uk beedies.co.uk bidi.co.uk biri.co.uk blu-seal.co.uk bullgroup.co.uk bullmall.co.uk bullnet.co.uk bullybeef.co.uk cctvstuff.co.uk century-lighting.co.uk charter-me.co.uk charter-this.co.uk charterthis.co.uk cobra-optics.co.uk cowes-boat-charter.co.uk cowesboatcharter.co.uk easy-sales-pro.co.uk fagpack.co.uk fishpaste.co.uk flowmiser.co.uk flybird.co.uk forum-france.co.uk forum-spain.co.uk forumfrance.co.uk forumspain.co.uk france-forum.co.uk franceforum.co.uk gameadvice.co.uk gamo-guns.co.uk gamo.co.uk gissowatt.co.uk henryvac.co.uk herbal-kick.co.uk holswap.co.uk investors-club.co.uk jims-rings.co.uk lockpicks.co.uk magnofuel.co.uk mamodspares.co.uk manor-ware.co.uk manorware.co.uk marc-james.co.uk nationaltoners.co.uk officebits.co.uk paintguns.co.uk payment-page.co.uk pccorner.co.uk pinkjets.co.uk prizefinder.co.uk quemex.co.uk radargun.co.uk radarguns.co.uk ragabone.co.uk scratchings.co.uk seemans.co.uk seemens.co.uk sicce.co.uk siemen.co.uk siemenssolar.co.uk slips.co.uk solent-charter.co.uk southord.co.uk spain-forum.co.uk spainforum.co.uk spanish-golf-villa.co.uk stickon.co.uk stirling-engines.co.uk sunnycott.co.uk sunnycottcaravanpark.co.uk</ a> sussexpad.co.uk tinplatetoys.co.uk toypen.co.uk traction-engine.co.uk travellers-joy.co.uk urlsales.co.uk velosolex.co.uk veronica-kits.co.uk viking-ebikes.co.uk vikingbikes.co.uk web-camera.co.uk wight-boat-hire.co.uk wight-charter.co.uk wightboathire.co.uk wightinvestments.co.uk wilesco-steam.co.uk xbows.co.uk yellowmaps.co.uk bullmall.com seemens.com sexy-pills.com health-pills.com bullelec