INTRODUCTION
Theory
Electrical resistance is one of the most important properties of materials. It is defined mathematically as the ratio of voltage to the current passing through a conductor. In physical sense, it is opposition a material offers to the current flowing through it. This opposition to the passage of electricity is a result of collisions between charge carriers and other sub atomic particles. The collisions reduce the drift speed of electrons that carry charges. Materials that offer greatest opposition to current flow are called insulators while those that allow current to flow through them with minimal hindrance are called insulators.
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