Unlike DC motor that uses a + and – pole an AC motor doesn’t have that so the capacitor is there so for a small second it reflects the voltage to go backwards in order to spin the motor (this is a starting capacitor) without it your appliance wouldn’t turn ON.
But once ON you would no longer need the capacitor. If a fan has been ON for a long period of time and you turn it OFF and then tried turning it ON again (after a while) and it doesn’t work. The capacitor is your faulty part.
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