Transformers work by using a primary inductor to convert electrical energy into low frequency radiation which will be absorbed by the secondary inductor that will convert this energy back into electrical energy. The output voltage is varied by changing the number of turns of the secondary inductor. But how does an auto-transformer work? Does it absorb the energy of the radiation it releases so that current can be sent to the load? Does it harness the principle of reverse current, so that when the magnetic field collapses, the generated current is sent to the load?