ARRL Technician Practice Exam

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In a circuit diagram, what is component 8 typically referred to?

Battery
Light emitting diode
Rectifier
Transformer

The correct answer is: Light emitting diode

In a circuit diagram, a component typically referred to as a light-emitting diode (LED) is identified by its symbol, which usually includes an arrow indicating light emission and often has two lead terminals. The LED's primary function is to emit light when electric current flows through it in the forward direction. This characteristic makes LEDs widely used in various applications such as indicators, displays, and lighting. When considering the roles of the other components mentioned, a battery is a source of voltage, a rectifier converts alternating current (AC) to direct current (DC), and a transformer is used to change AC voltage levels. While each has specific functions and symbols in circuit diagrams, they do not exhibit the unique properties of an LED, particularly in terms of light emission. Therefore, designating component 8 as a light-emitting diode is consistent with its function and symbol in typical electronic schematics.