Electromagnets and motors
- Created by: emews
- Created on: 15-11-17 16:24
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- Electromagnets and motors
- When an electric current flows in a wire it creates a magnetic field around the wire
- By winding the wire into a coil we can strengthen the magnetic field.
- We can make an electromagnet stronger by:
- wrapping the coil around an iron core
- adding more turns to the coil
- increasing the current flowing through the coil
- A voltage is produced when a magnet moves into a coil of wire. This process is called electromagnetic induction.
- To increase the induced voltage:
- move the magnet faster
- add more turns to the coil
- increase the strength of the magnet
- A simple electric motor can be built using a coil of wire that is free to rotate between two opposite magnetic poles.
- When an electric current flows in a wire it creates a magnetic field around the wire
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