# ‘mho’ is the unit of ______ of a substance.

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‘mho’ is the unit of ______ of a substance.
1. conductance
2. resistivity
3. conductivity
4. resistance

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Correct Answer - Option 1 : conductance

• 'Mho' is the unit conductance, while siemens is the SI unit of conductance.
• Conductance - It is the measure of how freely the free electrons(charge carrier) can flow.
• It is the reciprocal of electrical resistance, given by G.
• Conductance, G = $I \over V$

• Resistivity - It is the measure of electrical resistance offered by a material. It is given by rho (ρ).
• Resistivity, ρ = $RA\over l$, where R is resistance, A is area of cross-section, l = length of wire.
• Conductivity - The ability of a material to conduct electricity. It is the reciprocal of resistivity.
• Conductivity = $l\over RA$
• Resistance - Property of a material to resist the flow of charge carriers. It is given by R.
• R = $V\over I$(Ohm's law), also R = $ρl\over A$