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What is electrical resistivity? In a series electrical circuit comprising a resistor made up of a metallic wire, the ammeter reads 5 A. The reading of the ammeter decreases to half when the length of the wire is doubled. Why?

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Electrical resistivity is the measure of how much a material resists carrying an electrical current.

Electrical resistivity is denoted by the symbol ρ and has SI units of ohm meter (Ωm).

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