| A | B |
|---|
| direct current | Current that flows in only one direction through a wire |
| magnetic field | The area around a magnet where the magnetic forces act. |
| Generator | A device that produces an electric current by rotating a loop of wire in a magnetic field. |
| Magnetic poles | The opposite ends of a magnet. |
| Voltmeter | A device used to measure the potential difference of a circuit. |
| Ammeter | A device that measures electric current. |
| Superconductor | A material that does not have any resistance to the flow of electrons. |
| Transformer | A device used to increase or decrease the voltage of a power line. |
| Magnetic domains | Groups of aligned atoms in a magnet. |
| Electromagnetic induction | The process by which moving a wire through a magnetic field produces an electric current. |
| Alternating current | When current in a circuit reverses its direction in a regular pattern. |
| Superconducting | These trains would not lose energy to the environment. |
| Electric motor | A device that changes electrical to mechanical energy. |
| Magnetism | The property of matter in which there is a force of attraction or repulsion between unlike or like poles . |
| Electromagnet | This is formed when a current is passed through a coil of wire. |
