| A | B |
|---|
| Alternating current | electric current that reverses its direction at regular intervals |
| alternator | a small generator that produces an alternating current |
| armature | an electromagnet that rotates on an axle in an electric motor |
| direct current | electric current flowing in one direction only |
| electric motor | device that changes electric energy into kinetic energy, producing motion to do work |
| electromagnet | temporary magnet produced by electric current, consisting of a coil of wire wrapped around a core of iron or steel. |
| electromagnetic induction | creation of a current in a wire by changing the magnetic field. |
| generator | device that converts mechanical energy into electric energy |
| induced magnetism | result of magnetizing an object by means of a magnet. |
| law of magnetic poles | principle that like poles repel and unlike poles attract |
| magnetic field | region around a magnet where magnetic force affects magnetic materials |
| magnetic pole | one of two regions of a magnet where magnetic force is strongest. |
| superconductor | material that has no resistance to electricity, wasting no energy as heat |
| transformer | device used to increase or decrease voltage |
