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Find out how varying the length of a wire affects its resistance.
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Physics coursework Aim The aim of the experiment is to find out how varying the length of a wire affects its resistance. Prediction I predict that as the length of the wire increases, the resistance increases. Also that the resistance is proportional to the length of the wire, therefore as the length doubles the resistance doubles too. This is because the longer the length of the wire the more electrons (current) will be passing through, so therefore the more the possibility for the electrons to collide with the metal ions and cause the resistance to increase. Equipment The following equipment is what we need for the experiment: 1. An ammeter: this is to measure the current that will pass through the wire (to find out the resistance= p.d (potential difference/voltage) Current (in amps) 2. A voltmeter: to find out the potential difference across the wire and so to find out the resistance= potential difference (voltage) ...
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