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Why do they use magnets in Power Plants?

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Page 1: Why do they use magnets in Power Plants?. JOURNAL - Magnetism Draw a bar magnet –Label the poles –Draw what the field lines would look like How does the

Why do they use magnets in Power Plants?

Page 2: Why do they use magnets in Power Plants?. JOURNAL - Magnetism Draw a bar magnet –Label the poles –Draw what the field lines would look like How does the

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?

Page 3: Why do they use magnets in Power Plants?. JOURNAL - Magnetism Draw a bar magnet –Label the poles –Draw what the field lines would look like How does the

Magnetism: Magnetic Force

• Where is the magnet in the Power Plant? How does it work?

Page 4: Why do they use magnets in Power Plants?. JOURNAL - Magnetism Draw a bar magnet –Label the poles –Draw what the field lines would look like How does the

Magnetism: Magnetic Force

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

Page 5: Why do they use magnets in Power Plants?. JOURNAL - Magnetism Draw a bar magnet –Label the poles –Draw what the field lines would look like How does the

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?

Page 6: Why do they use magnets in Power Plants?. JOURNAL - Magnetism Draw a bar magnet –Label the poles –Draw what the field lines would look like How does the

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

Page 7: Why do they use magnets in Power Plants?. JOURNAL - Magnetism Draw a bar magnet –Label the poles –Draw what the field lines would look like How does the

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.

Page 8: Why do they use magnets in Power Plants?. JOURNAL - Magnetism Draw a bar magnet –Label the poles –Draw what the field lines would look like How does the

Magnetism

• What makes something magnetic?• The spin of its UNPAIRED ELECTRONS.

Electron spin aligns atoms and creates a magnetic field.

Page 9: Why do they use magnets in Power Plants?. JOURNAL - Magnetism Draw a bar magnet –Label the poles –Draw what the field lines would look like How does the

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!

Page 10: Why do they use magnets in Power Plants?. JOURNAL - Magnetism Draw a bar magnet –Label the poles –Draw what the field lines would look like How does the

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

Page 11: Why do they use magnets in Power Plants?. JOURNAL - Magnetism Draw a bar magnet –Label the poles –Draw what the field lines would look like How does the

Magnetism: Electromagnetic Force• Electromagnetic Force: the forces of

magnetism and electricity are both caused by electric charges.– MAGNETISM – electrons spinning– ELECTRICITY – electrons traveling

Page 12: Why do they use magnets in Power Plants?. JOURNAL - Magnetism Draw a bar magnet –Label the poles –Draw what the field lines would look like How does the

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)

Page 13: Why do they use magnets in Power Plants?. JOURNAL - Magnetism Draw a bar magnet –Label the poles –Draw what the field lines would look like How does the

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.

Page 14: Why do they use magnets in Power Plants?. JOURNAL - Magnetism Draw a bar magnet –Label the poles –Draw what the field lines would look like How does the

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.

Page 15: Why do they use magnets in Power Plants?. JOURNAL - Magnetism Draw a bar magnet –Label the poles –Draw what the field lines would look like How does the

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.

Page 16: Why do they use magnets in Power Plants?. JOURNAL - Magnetism Draw a bar magnet –Label the poles –Draw what the field lines would look like How does the

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.

Page 17: Why do they use magnets in Power Plants?. JOURNAL - Magnetism Draw a bar magnet –Label the poles –Draw what the field lines would look like How does the

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.

Page 18: Why do they use magnets in Power Plants?. JOURNAL - Magnetism Draw a bar magnet –Label the poles –Draw what the field lines would look like How does the

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.

Page 19: Why do they use magnets in Power Plants?. JOURNAL - Magnetism Draw a bar magnet –Label the poles –Draw what the field lines would look like How does the

Magnetism: Electromagnetic Force• USES: Transformer – a device that increases

or decreases voltage and current. Which one increases? Decreases?


Lecture 14 Magnetism. Magnets... two poles: N and S Like poles repel Unlike poles attract

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Magnets and Magnetic Fields Magnets Magnets attract iron-containing objects. Magnets have two distinct poles called the north pole and the south pole

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