What is component 8 in figure T2?

The correct answer is that component 8 is a light-emitting diode (LED). LEDs are semiconductor devices that emit light when an electrical current passes through them. They are commonly used in various electronic circuits for indication purposes, as they can provide visual feedback to the user.

In many diagrams and figures, including aspect T2, LEDs are typically represented by a specific symbol that denotes their function in the circuit, often accompanied by annotations about their forward voltage and current requirements. Understanding where LEDs are placed in a circuit helps in recognizing their role, such as signaling a power status or indicating data transmission in communication devices.

For clarity, while resistors, inductors, and regulator integrated circuits (ICs) serve important functions in electronic circuits—such as limiting current, storing energy, and regulating voltage—they do not provide the visual feedback characteristic of an LED. This makes LEDs distinct in their application and representation in circuit diagrams.