1.

In the transmission of a.c. power through transmission lines, when the voltage is stepped up n times, the power loss in transmission ……….

Answer»

INCREASES n TIMES
DECREASES n times
increases `n^2` times
decreases `n^2` times

Solution :Average power loss `P=I^2R`
but `I=V/Z`
`therefore P=V^2/Z^2R`
If the VOLTAGE is stepped up n times then, we get,
`P_1=n^2(V^2/Z^2)R`
`therefore P_1/P=n^2`


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