Endless Facts, One Snippet at a Time
Electromagnets: How Electricity Creates Magnetism
- An electromagnet is made by running electric current through a coil of wire.
- The flow of electrons creates a magnetic field around the coil.
- Adding an iron core inside the coil strengthens the magnet dramatically.
- Unlike permanent magnets, electromagnets can be turned on and off with a switch.
- The strength of an electromagnet depends on current, coil turns, and core material.
- Electromagnets power everyday devices like doorbells, speakers, and electric motors.
- Junkyard cranes use giant electromagnets to lift and drop heavy metal scraps.
- MRI machines rely on powerful electromagnets to peer inside the human body.
- Electromagnets show the deep link between electricity and magnetism discovered by Oersted and Ampère.
- From toys to trains, electromagnets are controllable magnets shaping modern technology.