Answer / shanmuganathan prathap

WE CANT CARRY HIGH CURRENT IN TRANSMITION LINE BCOZ NEED
BIG SIZE CONDUCTOR.THATS USING HIGH VOLAGE ACCORDING TO
P=VI SO V=1/I*P

Answer / lakshmi

at constant power for higher voltages the current is
reduced according to the equation P = V I cos (phi)
then I = P/V cos (phi)
reduced current means less losses and incresed efficiency.
and also the size of the conductor is less due low current.
hence it is economical to transmitt higher voltages.
thats why the generated voltages are stepped up to higher
voltages.

Answer / pandeyrahul

high current means more i*i*r losses which decreases the
efficiency

Answer / arunraj

Because to minimise power loss while transmitting.
For example: If power of 1000watts has to be transmitted to
certain distance through transmission line having a
resistance R ohm.If it was transmitted at 200volt, the total
power loss in transmission is

power=VI=1000watts

current=power/voltage=(1000/200)=5 Amps

power loss=(I*I*R)=5*5*R=25R watts
If it was transmitted at 2000 volts,

I=1000/2000=0.5 Amps
power loss=(0.5*0.5*R)=0.25R watts
now we can see that at high voltage transmission line
current is small. so we can use conductors with small
thickness instead large bars.

Answer / shahbaz shaikh

as we know that power transmission is depends on vtg and
current if we want to transmit high current then (as
current increases area and size ,cost incraeses) hence
transmission should be in high voltage

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