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Question:

Why does wire resistance decrease with the thicker wire?

I'm doing a science experiment and I don't know why resistance decreases as the diameter of the wire increases. Any help is appreciated.

Answer:

Basically a thick wire behaves as a lot of thin wires. Comparing one thin wire to a whole bunch, it is easy to see a difference. How this is explained in simple terms is that there are more paths for the electrons to take in a thicker wire, instead of them all being forced though the same space in the thin wire. You could compare it to cars on a motorway, the more lanes there are the more cars will be able to travel on it. A single lane would get blocked up if all cars in say four lanes tried to travel down it. Hope that explained things clearly!
Free flow of electrons.

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