What does the symbol for a filament lamp look like in circuit diagrams?

In circuit diagrams, the symbol for a filament lamp is represented as a circle with a horizontal line across the middle, often with some additional curly lines or dots that indicate the filament inside. This symbol is specifically designed to depict a filament lamp, which operates by passing an electric current through a thin wire (the filament), causing it to heat up and emit light.

While the other options represent different components — such as an LED (which usually appears as a diode symbol), a microphone (which has its unique representation), and a motor (typically depicted with a circle and additional connections) — they do not resemble the filament lamp. Each symbol is uniquely defined to help convey the specific component's function in a circuit, making it essential to recognize the correct symbols for understanding and constructing electrical circuits accurately.