Resistivity - A Level Physics
If I have two copper wires with the same diameter, but one is longer than the other, you can expect the longer wire to have a higher resistance.
That’s because an electron needs to make its way between more positive ions before it reaches the other end. This means resistance is proportional to the length of wire.
Two wires that have the same length but have different cross-sectional area will have different resistance. The larger the cross sectional area a wire has, the lower the resistance it has. Resistance is inversely proportional to area.
We also need a way to take into account the material's ability to impede the motion of electrons. This is called resistivity.
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