What in a circuit diagram represents a light bulb?

What in a circuit diagram represents a light bulb?

• A. Light bulb
• B. Resistor
• C. Battery
• D. Switch

Answer: (A)

In circuit diagrams, each component is shown with a standard symbol that conveys its function. A light bulb is represented by its own lamp symbol, typically drawn as a circle with a filament or cross inside, signaling a light-emitting device. When you see that symbol in a circuit, you know that part will light up when current flows. The other symbols correspond to different parts—resistors are shown as zigzag lines (or rectangles), batteries as pairs of long and short lines, and switches as a break in a wire—so the lamp symbol uniquely identifies the light source in the diagram.

In circuit diagrams, each component is shown with a standard symbol that conveys its function. A light bulb is represented by its own lamp symbol, typically drawn as a circle with a filament or cross inside, signaling a light-emitting device. When you see that symbol in a circuit, you know that part will light up when current flows. The other symbols correspond to different parts—resistors are shown as zigzag lines (or rectangles), batteries as pairs of long and short lines, and switches as a break in a wire—so the lamp symbol uniquely identifies the light source in the diagram.