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Basics in Magnetism Electromagnetism Force on a Current-Carrying Wire EM Induction Transformer Generators Electric Motors ELECTROMAGNETISM.

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Presentation on theme: "Basics in Magnetism Electromagnetism Force on a Current-Carrying Wire EM Induction Transformer Generators Electric Motors ELECTROMAGNETISM."— Presentation transcript:

1 Basics in Magnetism Electromagnetism Force on a Current-Carrying Wire EM Induction Transformer Generators Electric Motors ELECTROMAGNETISM

2 The ABCs of Magnets  How was magnetism discovered?  What are the two poles of a magnet?  What materials do magnets attract?  How do magnets attract objects?  Is the earth a magnet?  What was first invented out of magnets?

3 How was magnetism discovered? Magnetite or lodestone

4 What are the two poles of a magnet? North and South Pole Magnetic Domains Like poles repel; opposite poles attract. Like poles repel; opposite poles attract.

5 What materials do magnets attract? nickel iron cobalt

6 “Magneto attracts Ironman.”

7 How do magnets attract object? Magnetic Field Region of space around a magnet that applies an attractive or repulsive force Region of space around a magnet that applies an attractive or repulsive force Direction is from North to South Magnetic Field Lines

8 Drawing magnetic field lines Arrows are from North to South

9 Field lines of attraction Field lines of repulsion

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12 Is the Earth a magnet? Magnetic South Pole Magnetic North Pole Auroras

13 What was first invented out of magnets? Compass 指南针

14 Making Magnets: Which makes better magnets? iron steel Magnetizes quickly Keeps magnetism longer Temporary magnets (electromagnets) Temporary magnets (electromagnets) Permanent magnets

15 Some uses of permanent magnets Fridge door tools locks


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