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how does temperature aaffect the resistance of a metal .. semiconductor and a mettallic wire ? do th
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Conductors- resistance increases as temperature increase reason-As the temperature increases, the atoms that make up the lattice structure of conductors start to vibrate more vigorously [over greater distances]. As a result of this, mobile electrons in the conductor may collide more often with vibrating ions. Hence an increase in electrical resistance. Picture this, it is easier to walk in a street where people are only standing around, but if its busy [like rush hour Delhi], you'll find it harder to make your way through the crowd. Semi conductors - Resistance decreases as temperature increases reason- more kinetic energy for the elctron to jump from valence band to conduction band.. so when tempearture increases.. more electrons are in conduction band and hence less resistance |
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Mechanical Engineering BITS Pilani , Pilani campus |
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