Resistance of a Conductor (Resistance Formula Derivation) [HD]

This video lecture describes the resistance of a wire. how the resistance of a wire depends on its length, area and resistivity (specific resistance) of the material.

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Hi, if you have a twin copper cable with a CSA of 2.5mm do you have to half the final resistance as the voltage is going down 2 separate cables. In which case the CSA technically becomes 5mm so the resistance is less?