Question 26: NCERT Solutions for 12th Class Physics: Chapter 7-Alternating Current
Repeat the same exercise as in the previous question with the replacement of the earlier transformer by a 40,000-220 V step down transformer. (Neglect, as before, leakage losses through this may not be a good assumption any longer because of the very high voltage transmission involved). Hence, explain why high voltage transmission is preferred?
(a) Line power loss,
(b) Power supplied by the plant
(c) Voltage drop in the line,
So, by supply of electricity at higher voltage, 40,000 V instead by 4000 V the power loss is reduced greatly that is why the electric power is always transmitted at very high voltage.
Check the complete chapter with solutions.
NCERT Solutions for 12th Class Physics: Chapter 7-Alternating Current