A buzzer produces an audible tone when energized. The symbol is similar to a speaker but often shown as a semicircle or simplified shape. Buzzers are used in alarms, timers, and notification systems for simple audio alerts.
A lamp converts electrical energy into visible light. The symbol is a circle with an X inside, representing the filament. Lamps serve as load devices in circuits and are often used in educational examples.
An electric motor converts electrical energy into mechanical rotation. The symbol is a circle with the letter M inside. Motors are found in fans, pumps, compressors, and countless industrial and household applications.
A speaker converts electrical signals into sound waves. The symbol resembles a small cone shape extending from a vertical bar. Speakers are output transducers used in audio systems, alarms, and communication devices.
