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Answer: With 76 volts applied, the constant is 0.93v/3T = 0.31 V/T. Correcting that for 120 volts instead of 76, that becomes (0.31 V/T)(120/76) = 0.489 V/T.So the

**120 volt winding has 120 V / 0.489 V/T = 245 turns the 480 would have 4 times as many or 980 turns.**

Thats the answer what my teacher gave me but i dont understand it,if that's right can anyone explain me in detail. Or Should it not be like this when i tryed to solve it:

The worked out ratio is 0.31 V/T

Primary turn =

**1548 turns for 480 V**

Secondary turn =

**387 turns for 120 V**

Please any suggetions and explanations will be helpful.Thank you.