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Effect of temperature on the conductivity and resistance of a copper wire

The effect of temperature on conductivity Class practical The conductivity of a wire decreases as it is heated. However, some clamps are made from an alloy with a low melting point!!

Procedure a Set up simple series circuit with the variable power supply, the copper coil and the ammeter. Adjust the power supply until about 0. A very low voltage is needed. A greater potential difference will be necessary.

The effect of temperature on conductivity

Teaching notes 1 The emphasis in this experiment is on the change in the current when the temperature of the material is changed. The wider the temperature range the better. The potential difference remains constant. The variation of current with temperature is noted. It is possible to adapt this experiment so that both current and temperature can be measured. But a qualitative understanding of the concept might be all that is needed. The experiment can be extended by immersing the coil in a mixture of ice and salt.

Effect of temperature on conductivity and resistance.

Alternatively, it can be put in some solid CO2. However, there is a high probability of shorting out some of the coils and this is likely to mask the true current change.

  • Where the parameter defines Rank;
  • Penetration Depth Is a very thin layer through which high-current supercurrent on the surface of a material with high conductivity and by which high-conductivity material may cancel the magnetic field inside through the consolidation of this constant current[ 1 , 2 ];
  • The experiment can be extended by immersing the coil in a mixture of ice and salt;
  • Teaching notes 1 The emphasis in this experiment is on the change in the current when the temperature of the material is changed;
  • The experiment can be extended by immersing the coil in a mixture of ice and salt.

An aerosol freezer spray would be a safer option. This is obviously the inverse of resistance; use whichever concept seems appropriate in a given context.

Conductivity is the inverse of resistivity; both of these are properties of a material.

This effect can be made use of in constructing a resistance thermometer. The best thermometers using this effect are made from platinum. Constantan wire is designed to behave like this.

For a pure metal, resistance decreases approximately linearly towards a temperature close to 0 K. The temperature coefficient of resistance of many pure metals is close to 0.

You could link this to the idea that the resistance of a pure metal at room temperature is dominated by the vibration of ions, and this will reduce to zero close to 0 K. This experiment was safety-checked in October 2006.