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**Electric Current** is the charge in motion, when a potential difference between two charges forces a third charge to move.

It is measured by the time rate of flow of charge through the conductor. If *q* is the charge flowing through any cross-section of the conductor in time *t*, then,

*I* = $\frac{q}{t}$

If the rate of flow of charge varies with time, then the current at any time (instantaneous current) is given by,

*i *= $\frac{dq}{dt}$

where:

dq = is the small charge passing through any cross-section of the conductor

dt = small time (differential time)

One ampere of current is said to flow through a wire if at any section one coulomb of charge flows in one second. If n electrons are passing through any cross-section of the wire in time t, then,

*I* = $\frac{q}{t}$ = $\frac{ne}{t}$

where:

e = -1.6 x 10^{-19 }C

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