Examples of Electromagnetic Devices and their Uses
Some common examples of electromagnetic devices are,
- Electromagnetic Lock
- Solenoid
- Loud Speakers
- Electromagnetic Bell
- Electromagnetic Puller
- Motor
- Generator
- Electromagnetic Valves
- Tape Recorders
- Particle Accelerators
- Mass Spectrometer
Electromagnetic devices are those that use electromagnets for their operation. Now the question is what is an electromagnet and how do those devices use electromagnets for their operation. Electromagnetic devices are used in domestic households to industrial all areas. An electromagnet is basically a coil of wire wound on an iron core material. When an electric power supply is applied to that coil it produces a magnetic field that can attract some materials such as iron, nickel, cobalt, and many others. An electromagnet can behave like a conventional magnet, it also attracts and repels other magnets(electromagnet or permanent magnet).
The production and removal of a magnetic field are temporary. When the electric supply is available on the coil it has a magnetic field when the electric supply is removed the magnetic field also disappears. The magnetic field and its strength depend upon the amount of current flowing through the coil and the length of the coil or turns of the coil. The length of the coil is constant but we can vary the current flow, by increasing the current flow we can increase the magnetic strength of the coil, and by decreasing the current flow we can decrease the magnetic strength of the coil.
As I told you, the electromagnet can attract different types of materials and another magnet of opposite polarity. This attractive property is used by electromagnetic devices. For example, in a relay, an electromagnetic coil is there. So when a power supply is applied to the relay coil it attracts the contacts and makes a connection and isolation between NO and NC contacts respectively. Using this attraction property some devices are operated as listed below,
- Solenoid
- Valve
- Electromagnetic Puller
- Electromagnetic Lock
Also, we know that an electromagnet can repel another electromagnet or permanent magnet of opposite polarity. This principle is used in loudspeakers. Basically, a loudspeaker has a permanent magnet and an electromagnetic coil placed very near to it. The electromagnetic coil is placed in such a way that it can move with a diaphragm. So when an audio signal(an electrical signal) is applied to the electromagnetic coil it attracts or repeals the permanent magnet and moves according to it.
There are some disadvantages of electromagnets. First of all, it requires an electrical power supply. As the electromagnet is made up of coils and current flows through them, two types of losses happen - iron loss and copper loss. Copper loss happens due to the current flow and internal resistance of the coil. So these losses indirectly cause electrical power loss. Also, remember that most of the electromagnetic devices are involved in mechanical movement and mechanical operations. So these devices are also known as the electromechanical device. For example, a conventional relay, solenoid, and actuator can be called as both an electromechanical and electromagnetic device.
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Examples of Electromagnetic Devices and their Uses
Reviewed by Author
on
October 26, 2022
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Reviewed by Author
on
October 26, 2022
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