1.

e.0 I16. (i). Distinguish between the terms electrical resistance and resistivity ofconductor1 63 10-8/m has cross section

Answer»

Resistance

Resistanceofaconductoristheobstructionofferedbytheconductorintheflowofcurrentthroughit.Itismeasuredbythepotentialdifferenceneededacrosstheconductortoflowoneamperecurrentthroughit.

Theresistanceofaconductordependsuponitsmaterial,temperature,lengthandareaofcrosssection.

S.I.unitofresistanceisohm.

Resistivity

Resistivityisthepropertyoftheconductorduetowhichitoffersresistancetotheflowofcurrentthroughit.Itismeasuredbytheresistanceofferedby1mlengthofwireofthatmaterialofareaofcrosssection1m2.

Resistivityofthematerialdependsonlyonitsmaterialandtemperature.

S.I.unitofresistivityisohm-metre.

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