In the 1980's several leading electro technicians dealt with one of the most exciting technological issues of the time: the division of electric power into units and its transport to far distances. Most of them stood by direct current, but the brand new system, the alternating current that was used in the Ganz Factory launched the race between a.c. and d.c. Of course, d.c won the race.

Three engineers working for Ganz Factory, Károly Zipernowsky, Miksa Déri and Ottó Titusz Bláthy solved the problem of transporting electric power to considerable distances. It is less known that it is the system these three engineers invented that is still in use across the world.

The exhibition presents the circumstances of the invention of transformer, the development of technology related to it via authentic duplicates.