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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 |
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Answer» 1)Electrical resistivity is a fundamental property of a material that quantifies how strongly that material opposes the flow of electric current. A low resistivity indicates a material that readily allows the flow of electric current. Resistivity is commonly represented by the Greek letter ρ. 2)A lowresistivityindicates a material that readily allowstheflowof electriccurrent. Resistivityis commonly represented bytheGreek letter ρ (rho). TheSIunit of electrical resistivityistheohm-metre (Ω⋅m).3)In 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. Please hit a like if you find the answer useful |
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