| Question |
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| Answer |
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| alternating current (AC) |
An electric current that regularly changes the direction of its flow. |
| Armature |
The rotating electromagnet in an electric motor. |
| Curie temperature |
The temperature at which a permanent magnet loses its magnetic field. |
| direct current (DC) |
An electric current that flows in only one direction. |
| Domains |
Microscopic regions of materials that may be lined up to produce a magnetic field of force. |
| electric field |
The strengths and directions of the electric force at every point around the electrode are collectively called this. |
| |
|
| ferromagnetic |
Strongly attracted to magnets. |
| Generators |
A device that uses magnetic fields to convert mechanical energy into electrical energy. |
| geographic north pole |
Point at the “top of the world” where the axis of the Earth spins. |
| hertz (Hz) |
The unit of frequency’ one cycle per second. |
| lines of forces |
Show the direction the electrical force will move a positive charge. |
| magnetic fields |
Fields that show the strength and direction of magnetic forces. |
| paramagnetic |
slightly attracted to magnets. |
| Relays |
A switch used to turn solenoids on or off. |
| Solenoids |
Coiled wires use to form a magnet. |
| step-down transformer |
A series of coils that uses induction to produce a lower voltage. |
| step-up transformer |
A series of coils that uses induction to produce a higher voltage. |
| super conducting magnets |
A magnet made from special materials and kept at extremely low temperatures. |
Ch.18 LTI-MA 509
