Subelement C: Components— Topic 23: SCRs, Triacs
Question 3-23C2
Element 3 (GROL)What are the three terminals of an SCR?
Explanation
A Silicon Controlled Rectifier (SCR) is a type of thyristor, a semiconductor device used as a high-speed switch, often in AC power control. It has three terminals: the **Anode**, **Cathode**, and **Gate**. The Anode is the main current input, and the Cathode is the main current output. The Gate is the control terminal; a small current applied to the Gate triggers the SCR into conduction, allowing current to flow from Anode to Cathode.
Option B's "source" and "sink" are general terms for current flow in a circuit, not device terminals. Option C lists the terminals for a Bipolar Junction Transistor (BJT). Option D describes the terminals for a Unijunction Transistor (UJT). Each semiconductor device has distinct terminal names that reflect its internal structure and function.
Related Questions
3-22C6 What is the range of voltage ratings available in Zener diodes?3-23C1 How might two similar SCRs be connected to safely distribute the power load of a circuit?3-23C3 Which of the following devices acts as two SCRs connected back to back, but facing in opposite directions and sharing a common gate?3-23C4 What is the transistor called that is fabricated as two complementary SCRs in parallel with a common gate terminal?3-23C5 What are the three terminals of a TRIAC?