Title: 1. CONSTRUCT YOUR OWN MAGNET !!! JUST WITH ELECTRICITY
Course: THE MIST€RY OF ELECTRICITY.I > Section: 1. ELECTRIST€RY - MISTERY.I

What is an electromagnet?

An electromagnet is a magnet that is created when electricity flows through a conductor, otherwise, no magnet effect appears. Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. The poles (Nord- South) of an electromagnet can even be reversed by reversing the flow of electricity (poles + and -).

An electromagnet works because an electric current induces a magnetic field. The magnetic field goes around the conductor. The typical way in which electromagnets are built is to wrap many coils of wire around a ferromagnetic core. When electricity passes through the coils of wire, a magnetic field develops around it, which is caught in the ferromagnetic core.

How can I make an electromagnet?

It is fairly easy to build an electromagnet. All you need to do is wrap some copper wire around an iron core (look at the picture). If you attach a battery to the wire, an electric current will begin to flow and the iron core will become magnetized. When the battery is disconnected, the iron core will lose its magnetism. (RUNNING A REAL EXPERIENCE IN CLASS).

To learnt more watch the video 1: