A person or thing that produces excitement or stimulation.

A device or apparatus used to elicit a response or to cause activation.

उत्तेजक यंत्र

English Usage: The exciter in the machine helped to speed up the process.

Hindi Usage: मशीन में उत्तेजक यंत्र ने प्रक्रिया को तेज करने में मदद की।