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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.

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Presentation on theme: "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."— Presentation transcript:

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

5 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. –S–Strongest at the poles where field lines are CLOSE, weak where lines are FAR APART N S

7 A magnetic Field exerts a force on other fields. Like poles repel becauseUnlike 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 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. –A–Allows compasses to work –P–Protects us from cosmic radiation

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

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

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

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

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


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