1. Why do they use magnets in Power Plants?

2. JOURNAL - Magnetism Draw a bar magnet
Label the poles
Draw what the field lines would look like
How does the magnet in a power plant work? What does it do?

3. Magnetism: Magnetic Force
Where is the magnet in the Power Plant? How does it work?

4. Magnetism: Magnetic Force
Magnetic Force: The force a magnet exerts on another magnet, iron, or moving charges.

5. Magnetism: Magnetic Force
The force a magnet exerts on another magnet, iron, or moving charges.
Magnetic forces attract and repel one another
Like = repel
Unlike = attract
Why does this happen?
From where does this force come?

6. Magnetism: Magnetic Field
Magnetic force comes from the magnetic field that surrounds a magnet.
Strongest at the poles where field lines are CLOSE, weak where lines are FAR APART N S

7. Magnetism: Magnetic Field
A magnetic Field exerts a force on other fields.
Like poles repel because Unlike poles attract because field lines
Field lines push on each other. come together.

8. Magnetism What makes something magnetic?
The spin of its UNPAIRED ELECTRONS. Electron spin aligns atoms and creates a magnetic field.

9. Magnetism
A material that has all of its atoms aligned in a single DOMAIN is magnetic. Which one below is magnetic?
Unaligned atoms
Aligned atoms.
MAGNETIC!

10. Magnetism: Earths Magnetic Field
The Earth also has a magnetic field, the MAGNETOSPHERE, due to its iron core.
Allows compasses to work
Protects us from cosmic radiation

11. Magnetism: Electromagnetic Force
Electromagnetic Force: the forces of magnetism and electricity are both caused by electric charges.
MAGNETISM – electrons spinning
ELECTRICITY – electrons traveling

12. Magnetism: Electromagnetic Force
In the same way that spinning electrons create a magnetic field, traveling electric charges also create a magnetic field.
(see page 636)

13. Magnetism: Electromagnetic Force
How is this useful?
USES:
Solenoid: a coil of current-carrying wire. The more turns, the stronger the magnet. It creates a controlled magnetic field useful for many things.

14. Magnetism: Electromagnetic Force
USES:
Electromagnet: a coil of current-carrying wire with an iron core. The more turns, the stronger the magnet. Used in junkyards to lift heavy materials.

15. Magnetism: Electromagnetic Force
USES:
Turbine Generator – a device that induces (creates) an electrical current by spinning a magnet inside a coil of wire or vice versa.

16. Magnetism: Electromagnetic Force
USES:
Turbine Generator – a device that creates an electrical current by spinning a magnet inside a coil of wire or vice versa. Used at electrical power plants to create electricity.

17. Magnetism: Electromagnetic Force
USES:
Turbine Generator – a device that creates an electrical current by spinning a magnet inside a coil of wire or vice versa. Used at electrical power plants to create electricity.

18. Magnetism: Electromagnetic Force
USES:
Transformer – a device that increases or decreases voltage and current. Used when electricity is being transported to your home for use.

19. Magnetism: Electromagnetic Force
USES:
Transformer – a device that increases or decreases voltage and current. Which one increases? Decreases?