Explain the effect of rise in temperature on resistance of i) metal conductors ii) insulators iii) Alloys iv) semiconductors

Explain the effect of rise in temperature on resistance of i) metal conductors ii) insulators iii) Alloys iv) semiconductors, Electrical Dost

i) Metal conductors:
In the case of conductors when the temperature is increased, resistance also increases i.e. R α T.
e.g. copper, aluminum, gold, silver, etc.
ii) Insulators:
In the case of insulators, when the temperature is increased, resistance decreases. i.e. R α 1/T.
e.g. PVC, wood, rubber, mica, etc.
iii) Alloys:
The resistance of alloys is increased with an increase in temperature. For special alloys, resistance is constant at all temperatures. Hence they are used to make standard resistance boxes.
e.g. Constantan, manganin, eureka, etc.
iv) Semiconductors: The resistance of semiconductors decreases with increase in temperature

Explain the effect of rise in temperature on resistance of i) metal conductors ii) insulators iii) Alloys iv) semiconductors, Electrical Dost

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