If the number of turns in the primary side of the transformer is 200 and the number of turns in the secondary coil is 100 what is the ratio?

If the number of turns in the primary side of the transformer is 200 and the number of turns in the secondary coil is 100, the turns ratio is 200 to 100, or 2 to 1. This application would be a step-down transformer, reducing voltage by one half and doubling current.