Current ele

Question	Answer
an electric current exists in a region of space when there's a net transfer of charge through a surface from one side to the other side of the region	I=q/t I(av)=∆Q/∆t
if a current through a surface varies either with magnitude or direction or bith it is unsteady or varying	a current is steady if the rate of flow of charge is constant.steady current is time independent
one ampere=one coulomb of charge passing through the cross section of a conductor in one second	circuit is a closed conducting path through which charge flows
current density at a point is the current per unit area around that point,area being taken perpendicular to the direction of the current	j=I/S j=∆i/∆scosa where a is the angle between current and area element
electric current through a metallic conductor is directly proportional to the potential difference across is provided temperature and other physical conditions are a constant	V=IR where R is the electrical resistance of the conductor.
electric resistance is the opposition offered by a conductor to the flow of electrons	R=(ro)I/A where (ro) is the resistivity or standard resistance

Resource summary

	Created by Bhumika P almost 7 years ago