If a step-up transformer has a primary coil with 40 turns, how many turns would be required in the secondary coil in order to increase the voltage from 80 volts to 160 volts?

a. 8 turns
b. 30 turns
c. 80 turns
d. 160 turns

80 answers

Np/Ns = Vp/Vs =Turns ratio

Where; Np is the number of turns in the primary coil, Ns is the number of turns in the secondary coil, Vp is the voltage in the primary coil, Vs is the voltage in the secondary coil.

40/Ns = 80/160

40/Ns = 1/2

    Ns = 80 turns

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