how to calculate voltage drop in long distance cable? for an e.g lamp of

how to calculate voltage drop in long distance cable?
for an e.g lamp of 12 volt ac ,300watt is 90 meter away
from supply i.e (x'mer 230 v / 12v)and i m getting 8 volts
at lamp terminal ....

Question Posted / pram

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how to calculate voltage drop in long distance cable? for an e.g lamp of 12 volt ac ,300watt ..

Answer / k.prakashchandra

R = rho(of the metal) x length/sectional area.Pd=RxI

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