People use magnets to keep notes on refrigerator doors. They are an essential part of technology items such as speakers, motors and computer hard disks. Credit cards carry account information on a magnetic strip. Here are some short descriptions on how they care used:
Door Latch
Magnets are a simple, reliable way to latch doors on refrigerators and cabinets.
Speakers
From tiny ear buds to stadium PA systems, every speaker has a magnet in it. The stronger the magnet, the better the sound quality.
Toys and Games
Many familiar toys such as the Woolly Willy drawing game use magnets. Some construction toys use magnets to securely attach parts.
Motors
DC motors have a set of permanent magnets and electromagnets inside. When connected to a battery, the electromagnets repel the permanent magnets and make the motor spin.
Refrigerator Magnets
Refrigerator magnets are used for everything from notes to jokes to the pediatrician's phone number.
Credit Cards
Credit cards have a strip of magnetic material on their backs. Account data are recorded on it in a special, machine-readable format.
Transportation
Magnets are now used in the very advanced technology of public mass transportation known as the Maglev (from the words magnetic levitation) train. Watch the video clip to see how the magnetic system works.
Mr Pang,
ReplyDeleteSo, there are all sorts of different ways to use a magnet. They can make things. When I was at home, I watched a video that I'll like to share:
In a magnet, there are many small small magnets. When the big magnet attracts an iron nail, the small magnets come closer and also attract each other. When you cut a bar magnet into half, (if you use a microscope) you will see that inside there are many small magnets. Let me thinks of ways that magnets can be used:
the refrejirator doors, video tape, television, computer, printer, fax mechine......
This is the end of my sharing.
Cheers,
Irene lee wei ling
Wow!Cool!Anyway,its a long video!And more,I didi not know that magnets are soooooooo useful!
ReplyDeletePS:I got plenty of refrigerator magnets at home!
Cheers,
Margaret