Question

$\left(a\right)$ Why is parallel arrangement used in domestic wiring?
$\left(b\right)$ Sate the law which relates the current in a conductor to the potential difference across its ends.

Answer 1

Parallel arrangement is used in domestic wiring so as to provide equal amount of energy to all the appliances. Moreover if fault or short circuit occurs in any circuit it will nor not result in the disconnection to other circuits.

This reduces the equivalent resistance and results in consumption of less energy.

It is the Ohm's law which states that the current through a conductor between two points is directly proportional to the voltage across the two points providing physical conditions are same..

$\Rightarrow V=IR$