Question

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?

Answer 1

In a step-up transformer, the relationship between voltages on the primary and secondary coil and the number of turns in the two coils is

`(V_p)/(V_s) = (N_p)/(N_s)`
where V means voltage, N is the number of turns, and p and s refer to the primary and secondary coil, respecitvely.

In our example, we have Vp=80 V and Vs=160 V, and the primary coils have Np=40 turns, so we can find the number of turns in the secondary coil, Ns:

`N_s=N_p (V_s)/(V_p)=(40) (160 V)/(80 V)=80` turns