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An Experiment to Test the Resistance of a Wire What is resistance? When an electric current is flowing round a conductor, free moving electrons flow in the spaces between atoms. As they do this, they eventually collide with the atoms in the wire. This is resistance. Resistance is measured in Ohms (?). Because Resistance = Voltage ÷ Current (Ohm's Law), I will be able to work out the resistance of the wire by measuring the voltage and dividing it by the current running through the wire. What can affect Resistance? There are several factors which can affect the resistance of a wire. Firstly, the thickness of the wire can affect the resistance. This is because in a thinner wire, the atoms are more closely packed together, this means that electrons collide with atoms more often because there aren't as many spaces between atoms for the electrons to move. The length of the wire, the variable...

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