1. A device for changing an alternating voltage from low potential to a high potential or vice versa. 2. The process by which an emf is set up in a conductor located in a magnetic field, when the magnetic flux is cut by the conductor. 3. A current which has one direction during one part of a generating cycle and the opposite direction during the remainder of the cycle. 4. A device for converting mechanical energy into electrical energy. 5. These result from the resistance of the copper wires in the primary and secondary turns.​