Advertisement

Electromagnet , Electric generator uses , structure and types

From Online Sciences - October 9, 2017

The electric current can be used to generate a magnetic effect ( magnetic field ) or magnetism can be generated by electricity , There is a relation between magnetism and electricity , where electric current has a magnetic effect , while magnet generates an electric current .

The electromagnet

It is a temporary magnet which is made by the effect of electricity , It consists of a bar wrought ( soft ) iron , A twisted copper wire coiling around the bar of iron and a dry cell ( battery ) , When the electric current passes through the wire , the bar of the wrought iron works as a magnet .

When an electric current passes through a coil winding around a wrought ( soft ) iron bar , the iron bar becomes a temporary magnet that is called the electromagnet .

The magnetic force of the electromagnetic can be increased by increasing the number of coil turns , and by increasing the number of batteries , where the intensity of the electric current passing through the coil increases .

Wrought iron is used for making the electromagnet because the wrought iron gains and loses the magnetism easily , The magnetic force of the electromagnet increases by increasing the number of batteries because the intensity of the electric current passing through the coil increases .

Uses of the electromagnet

The electromagnet is used in factories to move ( lift ) the heavy iron blocks as it is used for making big-sized winch ( crane ) .

The electromagnet is used in making many appliances ( devices ) as the electric bell , the electric mixer , the disc drive and the television .

How the electromagnet used for moving up the heavy iron blocks ?

The huge electromagnet is hung in a big-sized winch , The winch depresses the electromagnet over iron or steel blocks ( or scrap cars ) to lift them , so , by passing the electric current through the coil of the electromagnet , it will attract the iron blocks and move them to another place , By cutting the electric current , the electromagnet loses its magnetic force and iron or steel blocks fall .

The electric effect of the magnet

In the 19th century , the English scientists Faraday discovered that when a magnet is moved inside a coil of wire , an electric current passes through the coil , so , the lamp lights , this means that the electric energy ( electric current ) can be generated by using a magnet , Faraday used this discovery to make an electric generator known as the dynamo .

The electric generator ( the dynamo )

Small dynamo

Huge dynamo

Advertisement

Continue reading at Online Sciences »