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Effect of temperature on conductivity and resistanceFeatured science projectScience project video

Conclusion

The hypothesis that when the temperature of a wire increases, the resistance value of the wire will also increase and  the conductivity of the wire will reduce is proven to be true.

The temperature of the wire increases due to its power loss, which is calculated as I2x R., where I is the current in the wire and R is the resistance. The higher the current in the wire or the higher resistance will cause the temperature of the wire to increase. Therefore it is important to choose the correct wire sizes to minimize this unwanted  loss and reduce the temperature of the conductor.
 

Also consider

What would happen if the experiment was repeated using different wire sizes?

The experiment can be repeated using aluminum wires.
 

References

Electrical resistance - http://en.wikipedia.org/wiki/Electrical_resistance

Electrical conductivity - http://en.wikipedia.org/wiki/Electrical_conductivity

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Complexity level:
7
Project cost ($):
20
Time required:
1 hour to prepare, 1 hour for observation
Material availability:
May be obtained from hobby stores, hardware supply shops, home depot etc.
Safety concerns:

Be careful when handling electric cables and knives. Adult supervision recommended.