The resistance of a sample depends on:
(a) what it is - copper has a very low resistance and plastic a very high one. Materials that have a very high resistance are called INSULATORS and those that have a low resistance are called CONDUCTORS.
(b) how long it is - a long wire has a bigger resistance than a short one of the same material and diameter
(c) how thick it is - a thick wire has a lower resistance than a thin one of the same length and material
