1. ELECTROMAGNETISM

2. What are some examples of when we use electricity?

3. What are some examples of when we use electricity?
How about magnetism?

4. Review The nucleus is made of _______ and ________.
________ orbit the nucleus.

5. Review The nucleus is made of protons and neutrons.
Electrons orbit the nucleus.

6. Neutral Positive Negative
Review
Neutral Positive Negative
Protons have a ______ charge
Neutrons have a ______ charge
Electrons have a _______ charge

7. Neutral Positive Negative
Review
Neutral Positive Negative
Protons have a positive charge
Neutrons have a neutral charge
Electrons have a negative charge

8. Orbit
Any guesses why the electron orbits the nucleus?

9. Orbit Any guesses why the electron orbits the nucleus?
The electron is negative so it is attracted to the proton which is positive.
Opposites attract.

10. Opposites Attract

11. What happens when an electron moves from one atom to another?
Review
What happens when an electron moves from one atom to another?

12. Review
ELECTRICITY

13. When this electricity passes through a wire we get a magnetic field

14. Discovery of electromagnetism
Year 1820

15. Hans Christian Oersted
Discovered that electric current produces not only thermal energy but also magnetic force.

16. Hans Christian Oersted
He noticed that when he placed a compass next to a current, the compass began to move.

17. Hans Christian Oersted
Did anyone else see that move??
Magnetic force.

18. Ampere also studied the relationship between electricty and magentism.
André-Marie Ampère
Ampere also studied the relationship between electricty and magentism.

19. Ampere also studied the relationship between electricty and magentism.
André-Marie Ampère
Ampere also studied the relationship between electricty and magentism.

20. André-Marie Ampère
He found that both were produced by a common particle.
He called this discovery the electrodynamic molecule.

21. We shall call my new discovery the electrodynamic molecule!
André-Marie Ampère
We shall call my new discovery the electrodynamic molecule!

22. We shall call my new discovery the electrodynamic molecule!
André-Marie Ampère
We shall call my new discovery the electrodynamic molecule!
Well just call it an electron instead….

23. Why is the needle of my compass moving???
So far in 1820….
Why is the needle of my compass moving???

24. So far in 1820…. Why is the needle of my compass moving???
It’s because of the electrons, of course!

25. He discovered that if you put a magnet through a wire loop,
Michael Faraday
A year later, Michael Faraday decided to experiment with electricity and magnets.
He discovered that if you put a magnet through a wire loop,
an electric current is
produced.

26. He invented the electromagnetic
Michael Faraday
He invented the electromagnetic
rotary device which
proves that changing
a magnetic field
produces an electric
field.

27. Michael Faraday Electromagnetic rotary device Dynamo
Modern electrical generator

28. We can use magnets to separate metals.
Separating Mixtures
We can use magnets to separate metals.

29. Electromagnets on TV

30. Earth’s magnetic field

31. Earth’s magnetic field

32. What causes the magnetosphere?
As the Earth spins, the liquid in the core moves too.
This movement creates the energy that causes the magnetic field.

33. Why is it important?
The magnetic field acts as a shield to protect the Earth from harmful radiation from the sun.

34. Compass Steel needle Fixed point Container
The North and South part of a magnet attract each other. Therefore, the needle points North because it is attracted to the South.

35. Electric bell

36. Is the bell on the left an open or closed circuit?
Electric bell
Is the bell on the left an open or closed circuit?
Why?

37. Maglev trains

38. Speakers
xxx

40. Birds!