Resistance is the property Of material by which it opposes (or resists) the flow of current is known as resistance.

**What Is Resistance**

The property Of material by which it opposes (or resists) the flow of current is known as resistance.

**Symbol Of Resistance**

The practical unit of **resistance** is ohm and is denoted by ohm: Ω

**Laws Of Resistance**

**The resistance offered by a conductor depend on following factors**

- (1) It is directly proportional to its length i.e. R
**∝**L - (2) It is inversely proportional to the area of cross section of the conductor, i.e. R
**∝**L/A - (3) It depend on the temperature of conductor.
- (4) It also depends on the nature of material of conductor.

Neglecting temperature and nature of conductor,resistance of conductor is **directly** proportional to its length and inversely proportional to area of cross section.

where “rho” is a proportionality constant and known as resistivity or specific resistance of conductor.

hence unit of resistivity is

(i.e. ohm-meter)

**Resistance** offered by 1 m length or conductor having cross sectional area of 1 m^{2} is called specific resistance of 1 ohm-m .

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