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e.0 I16. (i). Distinguish between the terms electrical resistance and resistivity ofconductor1 63 10-8/m has cross section |
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Answer» Resistance Resistanceofaconductoristheobstructionofferedbytheconductorintheflowofcurrentthroughit.Itismeasuredbythepotentialdifferenceneededacrosstheconductortoflowoneamperecurrentthroughit. Theresistanceofaconductordependsuponitsmaterial,temperature,lengthandareaofcrosssection. S.I.unitofresistanceisohm. Resistivity Resistivityisthepropertyoftheconductorduetowhichitoffersresistancetotheflowofcurrentthroughit.Itismeasuredbytheresistanceofferedby1mlengthofwireofthatmaterialofareaofcrosssection1m2. Resistivityofthematerialdependsonlyonitsmaterialandtemperature. S.I.unitofresistivityisohm-metre. thanks |
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