# Electromagnets

## 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.

This information came from the source;
http://kids.discovery.com/tell-me/curiosity-corner/science/how-do-electromagnets-work

## 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.

This information came from the source;