An electric current is the rate of flow of electric charge from one point to another in a conductor. The direction of current is defined opposite to the direction of movement of negative charges. Current is a scalar quantity.
The SI unit of current is ampere (A) or coulomb per second (Cs–1).
If n number of electrons cross the section of a wire in t second, then the magnitude of current is given by where e = 1.6 × 10–19C.
Resistance is a measure of opposition offered by a conduct on to the flow of current. Its SI unit is ohm (W). The resistance of conductors increases with temperature.
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