1. Copper Pipe and Neodymium Video Clip [2:17]
Watch the video below and then discuss with a partner what you observed and possible explanations for your observation.
Copper Pipe and Neodymium Video Clip [2:17]

2. Essential Question: What is the relationship between electricity and magnetism?
Standard: S8P5c. Investigate and explain that electric currents and magnets can exert force on each other.

3. Answer: Electric current exert forces to produce magnetism and magnetic fields exert forces to produce electricity.

4. Concepts for Review
1.The movement and alignment of electrons cause some materials to be magnetic
2. The movement of electrons also cause electric charges
3. An electric current (electricity) flows when electric charges move in a wire.
4. A wire that contains an electric current is surrounded by a magnetic field

5. 5. Current Carrying Wire
Direction of Current
Magnetic Field

6. What happens to the magnetic field if a current carrying wire is coiled (in loops)?

7. A single loop of wire carrying a current does not have a very strong magnetic field.
However, if you form many loops into a coil, 6. the magnetic fields will combine creating a much stronger field.

8. In fact, the magnetic field around a coil of wire produces a magnetic field similar to that of a bar magnet.

9. The diagrams below demonstrate the magnetic field of coiled wire (with an electric current) and a bar magnet using iron fillings.

10. How can the strength of the magnetic field of a coiled wire be increased?
7. Use more loops and increase the current

11. 8. An electric current can produce a magnetic field, therefore electricity can be used to make a magnet (Electromagnet).

12. 8. An Electromagnet is a current carrying wire wrapped around an iron core.
Q 9

13. How an Electromagnet Works
10. The magnetic field of the electric current in the wire makes the domains inside the iron core line up, magnetizing the core.
The magnetic field of the wire plus the magnetic field of the iron core makes the magnetic field of the electromagnet a hundred times stronger.

14. How can you make an electromagnet stronger?
11. To make an electromagnet even stronger, increase the number of loops, increase the electric current and have an iron core in the wire.

15. Electromagnets are very useful. Why?

16. Electromagnets
Electromagnets attract things only when a current exists in the wire
12. So, electromagnets can be turned on and off as needed

17. 12 Uses of Electromagnets
[scroll down to view animation]

18. 13. Uses of Electromagnets
Loud Speaker - The inner part is fixed to an iron coil that sits just in front of a permanent magnet. When you hook up the loudspeaker to a stereo, electrical signals feed through the speaker cables into the coil. This turns the coil into a temporary magnet or electromagnet. As the electricity flows back and forth in the cables, the electromagnet either attracts or repels the permanent magnet. 

19. Electromagnets are used in electric motors to transform electrical energy to mechanical energy.

20. 14. Electromagnets in an Electric Motor
Direction of Current
Magnet

21. 15. A magnet can produce an electric current, therefore magnets can be used to make electricity.

22. 16.The movement of wire through a magnetic field also produces an electric current in the wire.

23. 17. Generators convert mechanical energy to electrical energy by using magnets.

24. Magnetism: Motors and Generators [1:59]: https://www. youtube

25. What was our discovery in the activating strategy?
When the magnet moved through the copper pipe, an electric current was created.

26. So, what’s happening?
1. As the magnet is falling, the magnetic field generated by the magnet is moving through the copper.
2. The movement of the magnetic field generates an electric current inside the pipe.
3. Any time there is an electric current flowing, that electric current is generating its own magnetic field.
4. The tiny magnetic fields of the electric current are repelling the magnet.

27. Summarizer