What Devices Use Electromagnets? TL;DR Too Long; Didn't Read Some everyday devices that have electromagnets inside them include: Microphones, speakers, headphones, telephones and loudspeakers Electric motors and generators Doorbells and electric buzzers Computer hard drives Multiple household appliances. Related Articles Everyday Uses of Magnets.
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How Does a Solenoid Work? How to Use a Magnet to Create Electricity. How to Create a Powerful Magnetic Field. A Science Project on Magnetic Cars. Loudspeakers and tape recorders are devices that apply this effect. Some electromagnets can be very strong and its power can be readily turned off and on. Junk yard electromagnets, common doorbells and electromagnetic locks are examples.
Electromagnets can also be used to create continual motion when opposed by other electromagnets or permanent magnets. Examples include electric motors and maglev trains. This lesson will answer those questions. Useful tool: Units Conversion. You can change the strength of an electromagnet's magnetic field by varying the electrical current that passes through the wires wrapped around it. If you change the direction of the electrical current the polarity of the magnetic field reverses.
These effects can be used to move a loudspeaker cone back and forth, creating sound according to the electrical current through the wire. They also can be used to create magnetic fields in a magnetic tape or computer hard drive, such that it stores information.
The loudspeakers in your radio, television or stereo system consists of a permanent magnet surrounding an electromagnet that is attached to the loudspeaker membrane or cone. By varying the electric current through the wires around the electromagnet, the electromagnet and the speaker cone can be made to back and forth.
If the variation of the electric current is at the same frequencies of sound waves, the resulting vibration of the speaker cone will create sound waves, including that from voice and music. If you examine the back area of a loudspeaker, you should be able to see the permanent magnet and coil of wire for the electromagnet. Some loudspeakers use an electromagnet without the iron core, which is called a solenoid. When a Mylar tape covered with fine iron dust passes near a small electromagnet that has a varying magnetic field, according to an electrical signal, the dust become magnetized in different directions.
The electrical signal could be from a radio or microphone. There are two obvious advantages to using electromagnets. Firstly they can be switched on and off. Complete an electric circuit and a current passes to produce a magnetic field. Switch off the current and the magnetism disappears provided the iron forms a temporary magnet. Also, their magnetic strength can be changed. The strength of the magnetic field around the solenoid can be increased by:. Car scrap-yards use huge electromagnets to lift heaps of crumpled iron and steel.
Switch off the current and the object crashes to the ground. In the home, by far the most common use of electromagnets is in electric motors. Think of all of those bits of electrical equipment with some kind of electric motor: vacuum cleaners, refrigerators, washing machines, tumble driers, food blenders, fan ovens, microwaves, dish-washers, hair driers.
The list is a long one, and when you start thinking more widely about electric motors in cars, lawn-mowers and a whole host of industrial applications, it becomes obvious that this application of electromagnets is extensive and extremely important to our daily lives. The question of how electric motors work builds on the basics of magnetism introduced here, and is usually worked on in later years.
Electromagnetic door bells are make and break devices which work via an electromagnet.
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