What electromagnet can do?

Answer 1

First let's take a look at an electromagnet. Some are powered by a direct current or (d.c.) A solenoid is a "sucking magnet," put power to your coil and iron inside will be pulled rapidly inside. Another interesting property is easily demonstrated with a coil wire and a strong magnet. Connect the leads of the coil to a meter that will measure micro amperes. Insert a steel nail through the coil and stroke the magnet back and forth across the coil. The meter will indicate a few micro amperes with each stroke. The direction of the current, (polarity) will reverse on the back strokes. What an electromagnet can do is produce a potential difference of up to several volts. When the electromagnet is set up in a fashion that resembles a small electric motor attach a propeller to the shaft allowing the wind to turn the coil inside of the magnet housing thus generating voltage.