Question

write the expression for electric current​

Answer 1

Answer:

Electric current is a measure of the flow of charge, as, for example, charge flowing... Current is usually denoted by the symbol I. Ohm's law relates the current flowing through a conductor to the voltage V and resistance R; that is, V = IR. An alternative statement of Ohm's law is I = V/R.

Explanation:

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Answer 2

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The definition of electric current is rate of flow of charge through a unit cross sectional area….

I=Q/T….Q-Charge flown through a unit cross sectional area…..T-Time for flowing that charge.

Now,According to electron theory…….

Electric current I=n e A Vd…..

I-Electric current…e-charge of one electron(fundamental charge)

|e|=1.6×10^-19 Coulomb…

A-Area of cross section through which current is passing perpendicular….

Vd-Drift velocity of electron…

n-number of electrons per unit volume….

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