Electrical Dost

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Answer

What is stepper motor? What is its uses?

Answer: Stepper motor is the electrical machine which act upon input pulse applied to it.it is one type of synchronous motor which runs in steps in either direction instead of running in complete cycle.so, in automation parts it is used.

Why the capacitors works on ac only?

Answer: Generally capacitor gives infinite resistance to dc components (i.e., block the DC components). It allows the ac components to pass through.