 In this the last and final section, we learn about some of the neat applications of electromagnetism. We first start off with the motor. With an electromagnet, you can change which way is North/South by reversing the current. If you think about what would happen to a magnet close to another magnet if one of the magnets were to continually change polarity (North/South), you would probably see the magnet that has constant polarity spin around. Well this is exactly what a motor does. A motor has a little switch on its spinning axle that continually switches the polarity of the outside or ring part of the motor. The inside too is an electromagnet, but its current is controlled such that it is always repelled by the outside magnet. So when you turn the motor on, the magnet mounted on the axle in the center spins around and around, so long as there is current in the motor. This is one of the more simpler applications of electromagnetism. Click here to find out how to make your own makeshift motor. As we know already, electric currents have magnetic fields. If you know a little bit about the human brain, you may know that the brain operates on a series of electrical impulses, and hence has a definite magnetic field. When two magnetic fields move into each other's paths, you get something called interference. The interference causes the magnetic fields to change, and for our brains, this is not very good. This is why people are urged to stay away from high voltage items such as transformers, electric blankets, and excessive uses of hair dryers. The damage by the changed magnetic fields can lead to abnormal growth, disease, cancer, and a whole variety of other bad things. Remember to stay away from objects with high voltage and current. If you would like to learn more about these and other applications of electromagnetism, please follow some of the suggested links for this section or view the other content sections of this web page. Enjoy the wonderful world of science!! 
If you think you have mastered the subject |
A motor is
an application of electromagnetism. 