DC Generators and Motors
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| 1. An electrical generator is a device that converts ___ energy into ___ energy | mechanical, electrical
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| 2. The basic theory of electrical generation was discovered by ___ in 1831 | Faraday
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| 3. DC current flows in ___ direction in a conductor, while AC current flows in ___ directions | one, both
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| 4. Inducing a voltage into a conductor by passing it through a magnetic field is called ___ | electromagnetic induction
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| 5. There must be relative ___ between the conductor and the magnetic field in order to have a voltage induced | motion
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| 6. In order to induce one volt into a single conductor, ___ lines of flux must be cut in ___ | 108, one second
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| 7. The ___ makes up all non-rotating electrical parts of a generator or motor | stator
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| 8. At the start, or 0 degree position, of the armature rotation cycle induced EMF is ___ volts | zero
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| 9. The magnitude of voltage produced by electromagnetic induction can be increased by increasing the number of ___ in the wire that cuts the field | loops
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| 10. Voltage can also be increased by making the ___ stronger or by increasing the ___ of the wire | magnetic field, speed ( answer given??) (I think) number of loops (page 213
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| 11. What are some sources of mechanical energy used to turn the rotor of a generator | water, wind, fossil fuels, nuclear, manpower
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| 12. Which of the sources of mechanical energy must be converted into another form in order to turn the rotor | fossil fuels and nuclear
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| 13. Most modern commercial electric power is produced by __ | electromagnetic induction
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| 14. Electrical generators produce __ voltage | AC
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| 15. How is the voltage removed from an AC generator and applied to an external circuit | slip rings
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| 16. In DC machines a ___ is used instead of slip rings | commutator
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| 17. A commutator converts the ___ generated in the armature winding to a ___ output from the generator | AC, DC
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| 18. What rule relates motion, direction of magnetic field, and direction of current flow for electromagnetic induction | left hand rule for generators
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| 19. Applying the rule stated in question18, the middle finger indicates the direction of __- induced into the ___ | current, armature
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| 20. Electromagnetic induction can also be accomplished by moving a ___ across a ___ | magnetic field, conductor
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| 21. Explain how the commutator converts alternating current into direct current | pulsates AC to look like DC
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| 22. How much voltage is indued into the loop at the 1/2 turn or 180 degree position of the rotation | zero
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| 23. At what point(s) in the rotation of the armature is the maximum positive voltage induced | 90 degrees
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| 24. At what degree of rotation in a generator cycle is the maximum negative voltage produced | 270
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| 25. In a period of one second, a loop cuts 12 webers of flux. How much voltage would be induced into the loop | V = wb/1
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| 26. In DC motors and generator, the armature is the ___ and the field is the ___ | rotor, stator
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| 27. The armature is always the ___ on DC machines | rotor
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| 28. A commutator will have ___ pair(s) of segments for each coil in the armature | one
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Created by:
JoshHampton