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Electron Resistance
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For more on marking an answer as the "Best Answer", please visit our FAQ.hmm... im not too sure, but i think that everything in a circuit resists current, just from it passing through it, because energy is used up in the process of the electricity/electrons and such moving.
kk science lesson kids!
4 those that dont know :-
this resistance is measured in OHM's i think, and you can get resistors specially made to slow the flow of electrons to 1. conserve electricity and 2. make sure that a low powered light source such as a Light Emmitting Diode (LED) does not... short circuit? i dont know what its called... but its like what happens when you need a new light bulb, and you say "oh that light bulb has blown" lol, newayz rant over, hope that first paragraph helps.
wires consist of atoms, which are vibrating backwards & forwards unless their temperature is 0K which is practically impossible & bloody unlikely. anyway, these atoms are a lot bigger than the electrons (10000 times bigger or something of that order) the electrons are repelled by the positive charge of the nucleus, so can't travel through them. the resistance varies depending on the material that the wire's made from, the density, cross-section & length of the wire and something else, voltage maybe?
but essentially, it's the atoms in the wire vibrating that resist the flow of the electrons.