Question { 12200 }

what is mean by NTPC?,why didn't electric shock in train?

Answer

since the conductor lines are seperated by insulators,
current doesn't flow through train. so that we doesn't feel
electric shock.

for easy understanding answer this question:
some iron street light poles are available and it carry
current. could you tell me why it doesn't shock when we
touch it.

Question { 8632 }

Where there is voltage,there must be current.Is this right
or wrong??

Answer

wrong.
because for a current flow, the circuit should be closed
otherwise there is no current flow takes place
eg: battery.
when the voltage source is open then there is no flow of
current.
if we connect a load to a battery then current flow takes
place.

Question { 9806 }

EARTH AND NEUTRAL ARE JOINTED OR NOT?

Answer

no
if we take three pin socket(power socket) it has three pins
at bottom it has two pins of similar size's one is for
phase and another one for neutral which is mean for return
path of the circuit and
another pin in top is earth which is comparitively larger
in size because it's mean to take unwanted fault current to
ground
so that neutral is a return path to the circuit and earth
is meant for earthing the fault current
r u got it?