| A | B |
|---|
| Alternating current (AC) | Electric current that reverse its direction in a regular pattern |
| Ammeter | A galvanometer that measures electrical current passing through in amperes; connected in a series with the circuit |
| Direct current (DC) | Electic current that flows in only one directin through a wire |
| Electric motor | A device that contains a rotating electromagnet that changes electrical energy to mechanical energy |
| Electromagnet | Strong temporary magnet made by inserting an iron core into a wire coil and passing an electric current through the coil |
| Electromagnetic induction | Process by which electrical current is induced in a wire when it is moved through a magnetic field |
| Generator | A device that uses electomagnetic induction to induce electrical current by rotating loops of wire through a magnetic field |
| Magnetic domain | Groups of atoms with aligned magnetic poles |
| Magnetic field | The region around the magnet where magnetic forces act. |
| Magnetic pole | The two ends of a piece of magnetic material where the magnetic forces are strongest, labeled north pole(N) and south pole(S) |
| Magnetism | A property of some materials in which there is a force of repulsion or attraction between certain like and unlike poles |
| Superconductor | A supercooled material that has no electrical resistance, a current can flow indefinitely through it without losing energy |
| Transformer | A device that can increase or decrease the voltage of an alternating current |
| Voltmeter | A galvanometer that measures potential differences in volts and is placed in parallel across a part of the circuit |
