# Physics Assignment Help With Electric Current

## 11.2 Electric Current (I)

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.

### 11.3 Resistance (R)

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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