Question

Siemen is the S.I unit of
A. Electrical conductance
B. Electrical conductivity
C. Potential difference
D. Inductance

Answer 1

Hint: All the terms given are the electrical terms. We know the SI units of the mass and length and time and current and temperature i.e all fundamental quantities. Out of the given options we will eliminate the terms for which we know the units like potential difference and inductance. We will deal with the rest.

Formula used:
$R = \dfrac{{\rho L}}{A}$

Complete step by step answer:
Flow of a quantity with time is known as a current. Whereas in electric current the electric charge flows with time and the voltage difference and electric resistance combined will govern the electric current. Charge flows from higher voltage to lower voltage naturally.
Resistance is the obstruction to the flow of charge in the conductor. Resistance of the particular conductor is determined by the material property of the conductor called resistivity and length of the conductor and cross section area of the conductor.
It is given by the formula
$R = \dfrac{{\rho L}}{A}$
Where $\rho $ is the resistivity and L is the length of the conductor and A is the area of cross-section.
SI unit of resistance is OHM.
Conductivity will be inverse of resistivity and SI unit of conductivity will be Siemen per meter. SI Unit of potential difference will be volt. The SI unit of inductance will be henry.
SI unit of electrical conductance will be Siemen.

So, the correct answer is “Option A”.

Note:
We can tell the units of resistivity in terms of Siemen because resistivity will be the inverse of conductivity and we can express the units of resistivity in terms of ohm too. If we convert all these units in the form of fundamental quantity units, we can get the dimensional formula too.