The equation that relates the voltages and the number of turns in a transformer is
[tex] \frac{V_s}{V_p}= \frac{N_s}{N_p} [/tex]
where [tex]V_s = 120 V[/tex] is the voltage in the secondary coil, [tex]V_p=11000 V [/tex] is the voltage in the primary coil, and [tex]N_s [/tex] and [tex]N_p[/tex] are the number of turns on the secondary and primary coils.
Using the numbers, we find the ratio between the number of turns:
[tex] \frac{N_s}{N_p}= \frac{V_s}{V_p}= \frac{120 V}{11000 V}=0.0109 [/tex]
