Discussion
The speed of a universal motor is controlled in an appliance by
Answer: A
Correct answer: phase-angle control of the supply voltage with a triac
A triac fired part way through each half cycle passes only the later portion of the waveform, so the mean voltage and hence the speed can be varied continuously with a single inexpensive device. It is the standard drill and food mixer control, and it works because a series machine’s speed depends strongly on applied voltage.
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