To calculate the voltage in the secondary winding of the transformer, you would use the turns ratio formula which states that:
Secondary voltage / Primary voltage = Secondary turns / Primary turns
We know that the primary voltage is 120V and the turns ratio is 6:1, which means that for every 6 turns in the secondary winding, there is 1 turn in the primary winding.
Using the turns ratio formula, we can solve for the secondary voltage:
Secondary voltage / 120V = 6 / 1
Secondary voltage = 720V
Therefore, the voltage in the secondary winding of the transformer would be 720V.