Question

The inverse of resistance is called ?

Answer 1

Hint:The relationship between the potential difference across a conductor and the current through it is given by a constant. V is directly proportional to I and this constant is the resistance (R) of the conductor.

Complete answer:
The potential difference $V$ across the ends of a given metallic wire in an electric circuit is directly proportional to the current I flowing through it, provided its temperature remains the same. This is called Ohm’s law.
$\dfrac{V}{I}$= constant= $R$
$V= IR$
$R$ is a constant for a given metallic wire at a given temperature and is called its resistance.It is the property of the conductor to resist the flow of charges through it. Its SI unit is Ohm.

The resistance of a conductor depends upon
i) its length
ii) Area of cross section
iii) nature of material
It is directly proportional to the length of the wire and inversely proportional to the area of the cross section of the wire. The inverse of resistance is called the conductance. It is represented by the letter ‘G’. Its SI unit is mho or siemens.Conductance is the readiness with which a conductor transmits an electric current.

Hence, the inverse of resistance is called conductance.

Note: The factors on which the conductance of a material depends are length and the area of cross section. It is inversely proportional to the length and directly proportional to the area of the cross section of the wire.