What are the factors responsible for resistance of conductor ?
Answers
Answer:
Explanation:
Factors on which resistance of conductor depends are as follows :-
1. Length :-
Resistance of a wire is directly proportional to its length. If length of the wire is doubled, resistance will become double.
2. Area of cross-section :-
Resistance is inversely proportional to the area of cross-section of a conductor. A thin wire will have the more resistance than a thick wire.
3. Temperature :-
When we increase the temperature, resistance of metallic conductor will increase.
4. Nature of materials :-
A material may be a conductor with the low resistance, semiconductor with medium resistance an insulator having high resistance.
R ∝ l
R ∝ l/A
R ∝ l/A
R = ρ.l/A
ρ(rho) is a constant of proportionality called resistivity of a material of conductor.
Resistance
Resistance is the property of a current carrying conductor to obstruct/resist the flow of charges,i.e,flow of electrons
★Factors which determine Resistance:
Length of a conductor
- Resistance of a conductor is directly proportional to its resistance
- It the length is doubled so is the resistance
Area of the cross section
- Resistance of a conductor is inversely proportional to its area of cross section
- If the area of cross section is doubled,the resistance is halved
Temperature
- Temperature of the heat generated due to passage of current in the conductor also determines its resistance
Nature of material
- On the basis of the nature of the conductors,they can be conductors,semi conductors and insulators
- Conductors allow the free flow of charges
- Semiconductors are partial towards the flow of electrons though their conductivity can be made to vary
- Insulators completely resist the flow of charges