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| Seat Activity |
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Materials Required: 1. Approximately 2 meters of 26 gauge magnet wire (also known as motor rewind wire) 2. Approximately 60cm of 10 gauge or larger ground wire (4 gauge shown) 3. Magnet 4. "D" cell battery 5. Electrical Tape 6. Small piece of plywood (6x6 or so) |
| Make a coil with the magnet wire by wrapping it around something with a diameter smaller than the length of the battery. Use a small piece of tape at the ends to hold it together. |
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Bend the ground wire as shown to form the arms of the motor. Drill holes in the wood base for the arms. Arms are to be the length of the battery apart. |
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Tricks to help your motor run longer: 1. Balance the coil so that it hangs horizontally when
free. 2. Coat contacts with thin coat of petroleum jelly
(Vaseline).
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| Q1: How
does electromotive force aid or oppose this motor?
Q2: What variable causes the motor to want to spin one way and not the other? Q3: How does the magnet affect the rotation of the motor? Q4: Try using two magnets. How does it change the rotation? Why? Q5: Sketch and describe the magnetic fields in this motor, including how they change direction. Q6: Discuss possible improvements for this motor. Q7: Can
you think of any practical applications for this motor? |
| References |
| This device is described in Johnson, (1997).
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