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Assertion:At high temperature metal wire have a grater chance of short circuiting Reason:both resistance and resistivity vary with temperature. Is reason correct explanation of assertion

Answer:

(A) Assertion – At high temperature metal wire have a grater chance of short-circuiting

(B) Reason – both resistance and resistivity vary with temperature.

(1) The assertion and the reason both are right.

(2) But the reason for assertion isn’t the correct explanation.

(3) The movement of electrons increases when the temperature is greater.

(3) The rise in flow causes further heat dissipation that melts the insulation of wires and can cause the short circuit in the cable.

(4) Likewise, with temperature, resistance and resistivity also differ. The temperature rises with an increase in resistance.

Relation between resistance and resistivity

Resistance and the resistivity depend upon the thermal factor that is temperature and the nature of the material used. Let us know the relation between resistance and resistivity.

  • The resistance is directly proportional to temperature hence as resistance increases with the increase in temperature of the conductor.
  • Resistivity is also directly proportional to temperature.
  • Hence, resistivity also increases but for semiconductors it decreases.

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