1. Warm Up #17
How do you think an electromagnet works?

2. Lesson 2: Making Magnets with an Electric Current
Ch. 10 Magnetism
Lesson 2: Making Magnets with an Electric Current

3. Essential Questions
Why does a magnet apply a force on an electric current?
How do electromagnets and permanent magnets differ?
How do electric motors use magnets?

4. Making Electromagnets
The magnetic field of the coil causes the ferromagnetic core to become a magnet
The core greatly increases the strength of the coil’s magnetic field, which makes the electromagnet’s force stronger
As the number of loops in the coil increases, the magnetic field of the electromagnet becomes stronger

5. Properties of Electromagnets
An electromagnet is a special type of temporary magnet
The magnetic field around the electromagnet can be turned off by turning off the current
The strength of an electromagnet can be controlled
The poles of an electromagnet can be reversed

6. Magnets and Electric Motors
Electric motor – a device that uses an electric current to produce motion
Ex.: power tools, electric fans, hair dryers, computers, microwaves
Main parts are a coil of wire connected to a rotating shaft, a permanent magnet, and a source of electric energy

7. Making the Motor Spin
One useful property of electromagnets is their magnetic poles easily can be reversed, which is what makes an electric motor spin

8. Using Electric Motors
As the electromagnet spins, the shaft spins too, which is used to create other motions
Used to move windshield wipers, powered windows, CD players to spin the disk, etc.

9.
BrainPop - Electromagnets