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Physics coursework

I am going to investigate how the length of wire is going to affect the resistance of a wire.
I am going to measure the current each time I change the length of wire.
The current is a flow of negative electrons around the circuit. Electric current will only flow if there are charges which can move freely. This is why electric current flows so well in all metals. Electrons always move from a place where there are too many electrons to a place lacking electrons. The current in a series circuit is the same at all points. The current in a parallel circuit divides between the two different paths. Current always flows from –ve to +ve.
I am going to use the following equipment:

·A circuit board
·5 links
·6 wires
·An ammeter
·2 crocodile clips
·Constantan wire (various lengths)
·A power pack at 4V.
I have decided to use the power pack instead of the battery pack as this gives a constant voltage which makes the experiment fair; if I did use the......

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Approximate Word Count: 513
Approximate Pages: 3 (250 words per double-spaced page)

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