WHAT IS RESISTANCE ? -
Resistance is the property of a material to oppose the flow of current . basically it is done by inter molecular friction between the atoms . if the number of free electron is more then the resistance is less or vice-versa. |
| RESISTANCE |
This is represented by two circuits with equal voltages and different resistances. The circuit with the higher resistance will allow less charge to flow, meaning the circuit with higher resistance has less current flowing through it as shown in above figure.
LAWS OF RESISTANCE-
The resistance of any material depends on the factors as follows,
➤ length of the conductor ( directly proportional.)
➤ cross-section area of conductor( inversely proportional.)
➤ types of material
➤ temperature ( directly proportional)
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| LAWS OF RESISTANCE |
R - Resistance of conductor material
ρ - Resistivity of material or specific resistance
L - Length of the conductor
A - Area of cross-section of conductor
RESISTIVITY- (SPECIFIC RESISTANCE)
A measure of the resisting power of a specified material to the flow of an electric current is called resistivity of that material.
OR
The factor in the resistance which takes into account the nature of the material is the resistivity .