Welcome! Today we'll explore electromagnets. An electromagnet is a fascinating device that creates magnetism using electricity. Unlike permanent magnets, electromagnets only produce a magnetic field when electric current flows through them. This makes them incredibly useful in many applications.
The principle behind electromagnets is based on the relationship between electricity and magnetism. When electric current flows through any conductor, it generates a magnetic field around that conductor. By coiling the wire into loops, we can concentrate and strengthen this magnetic field, creating a much more powerful magnet.
One of the key features of electromagnets is that their magnetism is temporary. When we turn off the electric current, the magnetic field disappears immediately. This is demonstrated by turning a switch on and off. When current flows, the electromagnet attracts metal objects like iron nails. When we stop the current, the attraction stops completely.