Electromagnet | Wikipedia audio article
Channel: wikipedia tts
Date: 04/10/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Electromagnet


00:01:26 1 History
00:03:36 2 Uses of electromagnets
00:05:02 3 Simple solenoid
00:09:26 4 Physics
00:11:11 4.1 Ampere's law
00:12:51 4.2 Magnetic core
00:14:59 4.3 Magnetic circuit – the constant iB/i field approximation
00:18:27 4.4 Magnetic field created by a current
00:23:10 4.5 Force exerted by magnetic field
00:25:57 4.6 Closed magnetic circuit
00:27:55 4.7 Force between electromagnets
00:29:41 5 Side effects
00:30:02 5.1 Ohmic heating
00:31:53 5.2 Inductive voltage spikes
00:34:06 5.3 Lorentz forces
00:35:44 5.4 Core losses
00:38:10 6 High field electromagnets
00:38:20 6.1 Superconducting electromagnets
00:39:36 6.2 Bitter electromagnets
00:41:08 6.3 Explosively pumped flux compression
00:42:28 7 Definition of terms
00:42:38 8 See also



Listening is a more natural way of learning, when compared to reading. Written language only began at around 3200 BC, but spoken language has existed long ago.

Learning by listening is a great way to:
- increases imagination and understanding
- improves your listening skills
- improves your own spoken accent
- learn while on the move
- reduce eye strain

Now learn the vast amount of general knowledge available on Wikipedia through audio (audio article). You could even learn subconsciously by playing the audio while you are sleeping! If you are planning to listen a lot, you could try using a bone conduction headphone, or a standard speaker instead of an earphone.

Listen on Google Assistant through Extra Audio:
https://assistant.google.com/services/invoke/uid/0000001a130b3f91
Other Wikipedia audio articles at:
https://www.youtube.com/results?search_query=wikipedia+tts
Upload your own Wikipedia articles through:
https://github.com/nodef/wikipedia-tts
Speaking Rate: 0.880096657425811
Voice name: en-AU-Wavenet-A


"I cannot teach anybody anything, I can only make them think."
- Socrates


SUMMARY
=======
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.  Electromagnets usually consist of wire wound into a coil.  A current through the wire creates a magnetic field which is concentrated in the hole, denoting the center of the coil. The magnetic field disappears when the current is turned off.  The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.
The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.
Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical solenoids, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment.  Electromagnets are also employed in industry for picking up and moving heavy iron objects such as scrap iron and steel.