The free electrons are given energy and as a result move and collide with other free electrons that are next to it. For example gold has more free electrons than iron and as a result it is a better conductor.
VariablesVariables that I am going to keep the same. For starters I will go through the main definitions, to get a better knowledge of what is going to happen. When the wire increases then the resistance will Talking about investigating the resistance of a wire words - 4 pages Aim:The aim of this is to investigate how the length of a wire affects the resistance of it.
There are factors which can affect how accurate our expriment is come on four levels. I will set up a circuit like the one below and I will put a power supply on 2 Volts so that the wire will remain cool and keep the test fair. Investigate some of the factors that affect the resistance of a metal wire.
In a longer piece of wire, there would be more atoms for the electrons to collide with and so the resistance would be greater.
So, this effectively means that if the wire was trebled or quadrupled then the resistance would also treble or quadruple.
Background informationElectric current is a flow of electrons Physic Sc1 Resistance Of A Wire words - 6 pages How the resistance of a wire changes with different lengths Planning We are trying to find out if and how the resistance of a wire changes by adjusting the length of the wire.