Applications of permanent Magnets Flashcards
1
Q
Name some applications for permanent magnets:
A
- Speaker
- Hard drive
- Compass
- Microphone
- Reed switch
- Voltmeter/ammeter
- Cordless drill
- Fridge magnet
2
Q
What is magnetic screening?
A
The use of a ferromagnetic matterial to through the material instead of a magnetically sensitive device, ie: communications cable
3
Q
What are some practical examples of magnetic screening?
A
- Communications cables, e.g. coaxial cables, signal wiring
- Motor power cables
- Electronic motor control systems
- Visual Display Units (VDU)
- Electronic instrumentation systems
- Sensitive measuring equipment
- Electro-medical implants
- Magnetic tape storage
4
Q
What is a Reed switch?
A
An electrical switch that is operated by a magnetic field. Contacts are made from ferromagnetic material.
5
Q
What is a typical application of a Reed Switch?
A
Security door alarm trigger
