The resistance of the flow of electricity through a wire depends on the length and thickness of the wire.

The resistance of the flow of electricity through a wire depends on the length and thickness of the wire. The resistance R is measured in ohms and varies directly as the length L and inversely as the square of the diameter d. If a wire 200 ft long with diameter of 0.16 inch has a resistance of 64 ohms, how much resistance will there be if only 50 ft. of wire is used?