What are the factors affecting the value of the resistance of a conductor? Obtain their relationship. How is the resistance and resistivity of a conductor differed ?
Answers
Answer:
Resistance decreases with an increase of temperature. The thermistor is a temperature-dependent resistor and its resistance decreases as temperature rises. The thermistor is used in a circuit that senses temperature change. There are four factors on which resistance depends.
Length(L)
it’s cross-sectional area(A)
the type of material
nature of material
Resistance is the property of the material that restricts the flow of electrons. There are four factors affecting resistance which are Temperature, Length of wire, Area of the cross-section of wire and nature of the material.
When there is current in a conductive material, the free electrons move through the material and occasionally collide with atoms. These collisions cause the electrons to lose some of their energy, and thus their movement is restricted. This restriction varies and is determined by the type of material. The property of a material that restricts the flow of electrons is called resistance.
When there is current through any material that has resistance, heat is produced by the collisions of free electrons and atoms. Therefore, wire, which typically has a very small resistance, becomes warm when there is sufficient current through it.
Explanation: