Morgan Cydis

What is an electromagnet?

An electromagnet is a magnet that runs on electricity.

This information came from the source; http://education.jlab.org/qa/electromagnet_is.html

How does it work?

To make an electromagnet work, all you will need is a battery and some wire, and a compass to show the magnetic pull.

Take an ordinary AA or D battery and connect a piece of wire to run from the positive (+) side to the negative (-) side. Place the compass right near the wire. You should see that the needle moves away from North, and points in the direction of the wire. This is a sign that the wire is magnetized. Don't leave your wire connected for more than a minute or so, because the battery will drain very quickly. As soon as you take the wire off one end of the battery, the compass needle will return to normal.

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Who invented the electromagnet?

British electrician, William Sturgeon invented the electromagnet in 1825. The first electromagnet was a horseshoe-shaped piece of iron that was wrapped with a loosely wound coil of several turns. When a current was passed through the coil; the electromagnet became magnetized and when the current was stopped the coil was de-magnetized. Sturgeon displayed its power by lifting nine pounds with a seven-ounce piece of iron wrapped with wires through which the current of a single cell battery was sent.

Sturgeon could regulate his electromagnet; this was the beginning of using electrical energy for making useful and controllable machines and laid the foundations for large-scale electronic communications.

Five year later an inventor called Joseph Henry - made a far more powerful version of the electromagnet. American, Joseph Henry (1797-1878), demonstrated the potential of Sturgeon's device for long distance communication by sending an electronic current over one mile of wire to activate an electromagnet which caused a bell to strike. Thus the electric telegraph was born.

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