Across
- 2. is used for cycles per second
- 3. the wave in represents a voltage that slowly increases, with a uniform or linear rate of change, to its peak value, and then drops sharply to its starting value sinewave ( 12 words)
- 10. he voltage output across any two output terminals the three windings are connected in the form of a delta
- 11. suppose that the generator started its cycle at point b where maximum voltage output instead of starting at the point of zero output (10 word)
- 13. this is an arithmetic average of all the values in a sine wave for one alternation, or half-cycle. The half-cycle is used for the average because over a full cycle the average value is zero (12 words)
- 16. in an ac machine two or more collector rings enable the rotating loop to be connected to the stationary wire leads for the external circuit (9 words)
- 17. the number of cycles per second is harmonic consider a repetitive nonsinusoidal waveform such as a 100-Hz square wave its fundamental rate of repetition is 100 Hz exact multiples of the fundamental frequency are called (9 word)
- 21. represents a switching voltage first the 10V peak is instantaneously applied in positive polarity 10 words)
- 22. one complete revolution of the loop around the circle is a
Down
- 1. when a periodic variation is considered with respect to distance, one cycle includes the (10 words)
- 4. current generators are alternators for large power requirements the alternator usually has a rotating field and the armature is the stator(10 words)
- 5. the most common method of specifying the amount of a sine wave of voltage or claret is by relating it to the dc voltage and current that will produce the same heating effect (8 words)
- 6. also called star connections all three coils are joined at one end with the opposite ends for the output terminals (14 words)
- 7. an alternating voltage with an rmsvalue of 120 V for instance, is just as effective in heating the filament of a lightbulb as 120 V(14 words)
- 8. this electromagnet provides the flux cut by the rotor in a motor, current for the field is produced by the same source that supplies the(12 word)
- 9. these graphite connectors are spring mounted to brush against the spinning rings on the rotor (12 words)
- 12. the sine and cosine waveforms really have the same variations, but displaced by 90 in fact, both waveforms are called (8 words)
- 14. is a quantity that has magnitude and direction (6 words)
- 15. in an alternator with three generator windings equally spaced around the circle the windings will produce output voltages 1200 out of phase with each other (15 words)
- 18. a dc machine has a commutator ring instead of the slip rings
- 19. therefore, the induced voltage values shown in the graph decrease from the maximum value to zero at the half-turn, just as the voltage was zero at the start. The half-cycle of revolution is called (11 words)
- 20. A common unit for frequency multiples peakvalue this is the maximum value Vm(9 words)