10. Voltage can also be increased by making the ___ stronger or by increasing the ___ of the wire

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DC Theory 29

DC Generators and Motors

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

Created by: JoshHampton

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