ac supply is coventional to use and cheap.if use dc supply
instead ac supply it is comparatively dangerous.maintainence
cost is high.dc equipments are economically high and need
much proper maintainence
In power station ac power is generated and it is covenient
and easier to transmit and distribute ac power than dc power.
So most of the equipment are are designed for ac .So ac
supply in domestic purpose is mainly used .
in ac current flows in both cycle means synosoidal.but in
dc direct current flows which is hazadous.dc current is
harmful from safety point of view if it has to be used for
domestic purpose.for example if leakage current flows from
some applicance and if it is caught by human and if it is
dc than one can not not get rid of it as flow of current is
direct but if it is AC than one can get rid of it after
completion of cycle as it is alternate current so it is