Electrical resistance

Resistance definition:

Electricity means flowing of electron. If a conductor’s two points has potential difference, then negative charge flows over low voltage to high voltage. Though we know normally current flows from high potential to low potential.

At the time of flowing electron makes diffraction in the conductor. As a result flowing current hinders. These types of character of conductor are resistance. It stands that the cause of flowing electric current hinders across a conductor is resistance. This is the definition of resistance. Resistance measurement is easy. Division of total voltage and current is the resistance of a resistor.

From Ohm’s law at specific temperate,

I = V / R
Or, R = V / I

At a specific temperature the division of potential difference and flowing current signifies the resistance. We can measure resistance by it.
S.I resistance unit is Ohm. International unit of flowing current is Ampere (A) and potential difference is volt (V).

So,
1 Ohm = 1V / 1A

Dependence of resistance:
Resistance of conductor depends upon many terms given below

(i) Length of conductor

(ii) Material of conductor

(iii) Temperature of conductor

(iv) Resistance temperature

(v) Area of cross section of conductor

(vi) Effect of Pressure

(vii) Effect of Light

(viii) Effect of Magnet

(ix) Purification of conductor

(x) Resistance heat