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1. Distinguish between the resistivity and conductivity of a conductor.
Answer variants:
reciprocal of the electrical resistivity
resistance of a conductor
conductor's resistance
\(mho\ metre^{–1}\)
material's ability to pass the current
\(ohm\ metre\)
\(\sigma =\) \(\frac{1}{\rho}\)
\(\rho =\) \(\frac{RA}{L}\)
Resistivity
Conductivity
It is the
of unit length and unit area of cross-section.
It is the
of a material.
SI unit is 
.
SI unit is
.
It is a measure of 
to the flow of an electric current.
It is a measure of a 
through it.
 
2. What connection is used in domestic appliances and why?
 
All the electric circuits in a house are connected in .
 
The connections are made in parallel so that the  the other circuits.
Another benefit of connecting circuits in parallel is that each electrical appliance receives the .