What is a buzzer?

Answer 1

A buzzer is any mechanical, electromechanical, electronic, etc. device designed to produce a buzzing sound or vibration when activated. Some examples are:

• joy buzzer, a mechanical device used for practical jokes that is held in the palm and activated when the jokester shakes hands, causing an unpleasant vibration in the palm of the victim (shown in image above)
• electric buzzer, an electromechanical device that produces a buzzing noise and activated by connecting to electrical power
• piezo buzzer, an electronic device using the vibrations of a flat disk of piezoelectric material to produce a buzzing noise and activated by enabling it controlling electronic circuit

Answer 2

A relatively high voltage is developed across a buzzer by placing a resistance in the discharge path of an buzzer, e.g., by shunting one or more Zener diodes or LEDs across a switching transistor, the switching transistor being connected in series with the buzzer between a voltage potential and ground. Alternatively, the buzzer is shunted with a resistive element, with or without series connected a reversed biased diode. The result is a higher audio output without a corresponding increase in power consumption.

Answer 3

A buzzer is something which buzzes, such as a device which makes a buzzing sound when pressed, commonly used in Game Shows to indicate that a player knows an answer to a question.