5,157
edits
CLCStudent (talk  contribs) m (Reverted edits by Snowdrift on the Cloud Edge (talk) to last version by CLCStudent) 
(Fix errors: Charge is supposed to be represented with a lowercase q not a uppercase Q) Tag: 2017 wikitext editor 

 unit = [[coulomb]]
 otherunits = {{Unbulleted list[[elementary charge]][[Faraday constantfaraday]][[amperehour]]}}
 symbols = ''
 baseunits = C = A s
 dimension = '''T''' '''I'''
An electric charge has an [[electric field]], and if the charge is moving it also generates a [[magnetic field]]. The combination of the electric and magnetic field is called the [[electromagnetic field]], and its interaction with charges is the source of the [[electromagnetic force]], which is one of the four [[fundamental interactionfundamental forces]] in [[physics]]. The study of [[photonsphoton]]mediated interactions among charged particles is called [[quantum electrodynamics]].
The [[SI derived unit]] of electric charge is the [[coulomb]] (C) named after French physicist [[CharlesAugustin de Coulomb]]. In [[electrical engineering]], it is also common to use the [[amperehour]] (Ah); in [[physics]] and [[chemistry]], it is common to use the elementary charge (''e'' as a unit). Chemistry also uses the [[Faraday constant]] as the charge on a [[mole (unit)mole]] of electrons. The lowercase symbol ''
==Overview==
==Units==
The [[International System of UnitsSI]] derived unit of [[quantity]] of electric charge is the [[coulomb]] (symbol: C). The coulomb is defined as the quantity of charge that passes through the [[cross section (geometry)cross section]] of an [[electrical conductor]] carrying one [[ampere]] for one [[second]].<ref name=CIPM1946>{{cite web url=https://www.bipm.org/en/CIPM/db/1946/2/ publisher=BIPM title=CIPM, 1946: Resolution 2}}</ref> This unit was proposed in 1946 and ratified in 1948.<ref name=CIPM1946/> In modern practice, the phrase "amount of charge" is used instead of "quantity of charge".<ref name=SIBrochure>{{SIbrochure8th}}, p. 150</ref> The amount of charge in 1 electron ([[elementary charge]]) is approximately {{val1.6e=19u=C}}, and 1 coulomb corresponds to the amount of charge for about {{val6.24e=18u=electrons}}. The lowercase symbol ''
After finding the [[charge quantizationquantized]] character of charge, in 1891 [[George Johnstone StoneyGeorge Stoney]] proposed the unit 'electron' for this fundamental unit of electrical charge. This was before the discovery of the particle by [[J. J. Thomson]] in 1897. The unit is today treated as nameless, referred to as {{emelementary charge}}, {{emfundamental unit of charge}}, or simply as {{eme}}. A measure of charge should be a multiple of the elementary charge ''e'', even if at [[macroscopic scalelarge scales]] charge seems to behave as a [[real numberreal quantity]]. In some contexts it is meaningful to speak of fractions of a charge; for example in the charging of a [[capacitor]], or in the [[fractional quantum Hall effect]].
Thus, the conservation of electric charge, as expressed by the continuity equation, gives the result:
:<math>I = \frac{\mathrm{d}
The charge transferred between times <math>t_\mathrm{i}</math> and <math>t_\mathrm{f}</math> is obtained by integrating both sides:
:<math>
where ''I'' is the net outward current through a closed surface and ''
==Relativistic invariance==
Aside from the properties described in articles about [[electromagnetism]], charge is a [[theory of relativityrelativistic]] [[charge invarianceinvariant]]. This means that any particle that has charge ''
==See also==
