Electromagnets
ScienceDefinition
An electromagnet is a type of magnet created by running electric current through a coil of wire, usually wrapped around a ferromagnetic core like iron. Unlike permanent magnets, electromagnets can be turned on and off and their strength can be adjusted.
Examples
- Junkyard cranes use powerful electromagnets to lift and drop scrap metal on demand
- MRI machines use superconducting electromagnets to create strong magnetic fields for medical imaging
- Electric doorbells use an electromagnet to strike a bell when current flows through the circuit
Key Fact
Electromagnet strength increases with more coil turns, stronger current, and a ferromagnetic core.
Study This Concept
Practice electromagnets with free review games in these units: