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What is electrical resistivity ? Derive its SI unit. In a series electrical circuitcomprising a resistor made up of a metallic wire, the ammeter reads 100 mA. If thelength of the wire is doubled, how will the current in the circuit change? Justify youranswer.

Answer»

Electrical resistivity is a fundamental property of a material that quantifies how strongly that material opposes the flow of electric current. SI unit: Siemens per meterIn a series electrical circuit comprising a resistor made up of a metallic wire, the ammeter reads 100mA. The reading of the ammeter decreases to half when the length of the wire is doubled. ... Hence according to ohms law for a given potential difference, the current reduces to half.



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