Question

A step-up transformer has primary coil with 15 turns. How many turns would be required in the secondary coil to increase the voltage from 60 v to 160 v? 15 x=160/80
x=80/15
x=?
where did the 80 come from? The primary voltage is 60

N/15=160/60
N= 15*160/60=40 turns.

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