Determine the number of turns of the primary winding of a transformer connected to a voltage of 380 V, if the number of turns of the secondary winding is 200 and the output voltage is 19 V.

4000 turns

Explanation:

The formula to apply is ;

Voltage in secondary coil/ Voltage in primary coil = Turns on secondary coil/Turns in primary coil

Vs/Vp =Ns/Np

Given that;

Ns=200

Vp=380 V

Vs=19 V

Applying the formula as;

Vs/Vp = Ns/Np

19/380 = 200/Np

1/20 =200/Np

Np = 200/0.05

Np= 4000 turns

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