Homework Help: Physics

Posted by Crystal on Tuesday, March 1, 2011 at 10:03am.

An ideal transformer is needed to step the voltage down from 400V to 115V. The primary has 400 turns. How many turns would be necessary on the secondary side?

Physics - Henry, Wednesday, March 2, 2011 at 10:56pm
Np/Ns = Vp/Vs,
400/Ns = 400/115,
Ns = 115 = Turns on secontary winding.

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