Application to the Calculation of small transformers / autotransformers The app calculates the turns ratio for the construction of single-phase transformers / autotransformers. It makes use of two methods for the calculation. One on the power Va, the app returns over the turns ratio, wire section also the type of plate to be used is the thickness of the package. One according to the size of the spool. The app calculates the power of the minimum and maximum should be given guidance on the ki