1. 21.1 Magnets and magnetic fields
Chapter 21: Magnetism
21.1 Magnets and magnetic fields

2. Remember: Notes will be graded!

3. Bellringer: What do you know?
What are the properties of magnets?
What is a magnetic field?
SPS10.c Investigate applications of magnetism and/or its relationship to the movement of electrical charges as it relates to: electromagnetics, simple motors, and permanent magnets

4. Magnetic Force

5. Magnetic Poles

6. Magnetic Field

7. Earth’s Magnetosphere

8. Magnetic Materials Magnetic vs. Magnetized
Ferromagnetic – can be magnetized
Magnetic Materials

9. Non-magnetized Materials
Ferromagnetic, but not a magnet
Non-magnetized Materials

10. Temporary or Permanent?
Magnetized materials

11. Permanent Magnets

12. Important facts

13. Anti- theft Security Device

14. Questions to answer! 1. Describe the interaction of magnetic poles.
2. What two things can happen to a magnet entering a magnetic field?
3.What makes a material magnetic?
4.How are electrons responsible for magnetism?
5. What will happen if you break a magnet into two pieces?
Questions to answer!

15. Chapter 21: Magnetism
21.2 Electromagnetism

16. Electromagnetic Force
Electricity and magnetism are related.
Movement of electrons cause both.
Electromagnetic Force

17. Magnetic fields & moving charges
Moving electric charges create magnetic fields.
Magnetic fields & moving charges

18. Electromagnetic devices
galvanometer
Electromagnetic devices

19. Electromagnetic devices
Electric motor
Electromagnetic devices

20. Electromagnetic devices
loudspeakers
Electromagnetic devices

21. Questions: Besides a magnet, what can create a magnetic field?
How is the magnetic field of an electromagnet controlled?
How are magnets used in galvanometers, electric motors and loudspeakers?
Questions:

22. 21.3 Electrical Energy Generation and Transmmission
Chapter 21: Magnetism
21.3 Electrical Energy Generation and Transmmission

23. Generators Induction: Faraday’s law
Moving magnet + wire coil = electric current
Generators

24. AC or DC Generators
Generators

25. Transformers increase or decrease voltage and current

26. Primary and secondary coils in transformer
Transformers

27. Transformers Step up or step down? Increase voltage = decrease current
Depends on # of turns in coils
Transformers

28. Electrical Energy at Home
Coal, hydro, nuclear or wind
All cause a generator to spin
Electrical Energy at Home

29. Questions: How is voltage induced in a conductor?
What are two types of generators?
How does a transformer work? What does it do?
What are six sources of electrical energy?
Questions: