FI5 Notes. FI5- What is an electromagnet? Electromagnets are magnets that have their magnetic field produced by electric current. The magnetic field disappears.

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Presentation transcript:

FI5 Notes

FI5- What is an electromagnet? Electromagnets are magnets that have their magnetic field produced by electric current. The magnetic field disappears when the electric current is turned off and reappears when the electric current is turned on.

FI5- How are electromagnets made? Electromagnets are made when a large number of coils of wire are wrapped around a piece of iron. The more coils or the higher the current of the electricity flowing through the wires the stronger the electromagnet will be. A simple electromagnet:

FI5- Uses of electromagnets Electromagnets are common in electrical devices, motors, generators, speakers, computer hard disks, MRI machines, and scientific equipment.

FI5- Electric motors Electric motors are used in many devices. The idea behind electric motors are simple: Place an electromagnet in the middle of a permanent magnet. When the electromagnet is turned on the magnetic fields interact and the electromagnet begins to spin.