Download Creating Electricity from Magnetism

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Creating Magnetism From Electricity
Detecting Magnetism. (Page 60)
1. Use a compass to explore the magnetic field around a bar magnet. Write down your observations. You may
wish to draw a picture. Show your results to the teacher before you go to the stations.
Station #1. Wire Loop. (Page 66)
2. Connect the wire loop to a power source so that electricity will travel through it. Observe the behavior of
compasses near the wire. Write down your observations.
3. What happens if you reverse the direction of the current?
Station #2. Solenoid. (Page 67)
4. Run an electric current through a coiled wire. Describe the behavior of a compass placed near the coil.
5. Where does the magnetic field seem to be greatest?
6. What is the effect of reversing the direction of the current?
Station #3. Electromagnet. (Page 68)
7. Put an iron nail through the center of your solenoid. Now run an electric current through the solenoid. How
does the presence of the nail effect the performance of the solenoid? The solenoid is now referred to as an
electromagnet.
8. Which of the two electromagnets at your station is the strongest? Why?
Station #4. The Swing. (Page 68)
9. Place the swing inside a horseshoe magnet so that the bottom of the swing is right between the north and the
south poles of the magnet. Run an electric current through the swing. What happens to it?
10. What happens if you reverse the direction of the current?
Station #5. DC Motor. (Page 69)
11. What is the definition of a motor?
12. See if you can get the St. Louis motor to work by running an electric current through it. Explain how it
works.
13. What is meant by DC?
14. Give three examples of DC motors that you have used.
(1)
(2)
(3)
Station #6. AC Motor. (Pages 69-70)
15. What is meant by AC?
16. View the computer simulation of an AC motor. Explain how an AC motor works.
17. Give three examples of AC motors that you have used.
(1)
(2)
(3)
Station #7. A Tater Cell. (Pages 70-71)
18. Try to get electricity to flow through a circuit using a potato as the electrolyte for a “wet” cell. Detect the
flow of electricity with a galvanometer. Explain how the cell works.
19. What will happen if you reverse the leads to the galvanometer?
20. Which electrodes worked best?
21. Explain how a galvanometer works.
Conclusions.
22. Can you create an electric current without simultaneously creating a magnetic field?
23. How does the direction of the electric current affect the magnetic field that it creates?
24. Describe two ways that you can increase the strength of the magnetic field created by an electric current?
(1)
(2)
25. What is meant by a motor?
Read Section 3-1 on pages 66-71. Answer section review questions #1-4 on page 71.
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