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To investigate how the length and thickness of a piece of metal wire can influence its resistance.
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- Words:
- 978
- Submitted:
- Fri Oct 24 2003
... Physics: Resistance coursework Aim: To investigate how the length and thickness of a piece of metal wire can influence its resistance. Introduction Electricity is conducted through a conductor, e.g. a wire , by free electrons. The number of free electrons depends on the material and more free electrons means a better conductor, this would have less resistance. The free electrons are given energy and as a result move and collide with neighbouring free electrons. This happens across the length of the wire and thus electricity is conducted. Resistance is the result of energy loss as heat. These collisions convert some of the energy that the free electrons are carrying into heat. A wire has a certain resistance to the current, the greater the resistance, the greater the current, the more voltage is needed to push a current through the wire. The resistance is calculated by R = V where V = Voltage, I = Current and
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