Which component is represented by the symbol for emitting light?

Which component is represented by the symbol for emitting light?

• A. Resistor
• B. Capacitor
• C. Transformer
• D. Light Emitting Diode

Answer: (D)

In schematics, light emission is shown by small arrows coming off the symbol. A diode shape with arrows pointing away indicates a device that emits light when forward biased. Among common components, only the light emitting diode is designed to produce light in operation, so this symbol identifies that device. Resistors are shown as a zigzag line, capacitors as two parallel plates, and transformers as two inductors with a core; none of these include indicators of light emission. So the symbol with outward arrows corresponds to a light emitting diode.

In schematics, light emission is shown by small arrows coming off the symbol. A diode shape with arrows pointing away indicates a device that emits light when forward biased. Among common components, only the light emitting diode is designed to produce light in operation, so this symbol identifies that device. Resistors are shown as a zigzag line, capacitors as two parallel plates, and transformers as two inductors with a core; none of these include indicators of light emission. So the symbol with outward arrows corresponds to a light emitting diode.