## Summary

Electric current is the price at which fee flows through a surface.Electric existing is frequently just referred to as current.As a scalar, existing has size only.The prize for current is ns (italic) native the intensity that a current.In equation form, existing can be written as…average currentinstantaneous current
Iave=∆q
∆t
I=
 lim ∆t→0
∆q=dq∆tdtWhere…
 I= electric current ∆q,dq= charge passing with some area ∆t,dt= interval, prompt of time
The SI unit of present is the ampère .An ampère is a coulomb per second.
 A= C s
The unaccented spelling ampere is also acceptable in written English.The shortened kind amp is frequently acceptable or also preferred.The SI unit of charge is the coulomb The coulomb is a acquired unit.One coulomb is the quantity of charge moved by one ampère of existing in one second of time .Current density is a amount related to electrical current.The price for current density is J (bold).As a vector, existing density has actually magnitude and direction.By definition, current density is the product of charge density (ρ) and velocity (v).The size of present density is likewise equivalent come the proportion of existing (I) to area (A).In equation form, present density have the right to be composed as…vector definitionmagnitude equivalent
JvJ=I
A
Where…
 J,J= current thickness as a vector or its scalar magnitude I= electric current ρ= charge thickness v= drift velocity A= area
The SI unit of current density is the ampère per square meter
.Microscopic summary of currentThe macroscopic phenomenon the electric present can be explained by the net activity of microscopic charged particles.In equation form, the microscopic description of current and current thickness can it is in written…microscopic currentmicroscopic existing density
I=nqAvJ=nqv
Where…
 I= electric current J= current density n= particle thickness q= charge per particle v,v= drift velocity A= area

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All of the following are examples of electric current except

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