🔍 Key Concepts

• Count how many terminals the symbol in figure 9 has and note their labels (G, MT1, MT2, A, K, etc.). • Recall which of the listed components are two-terminal devices versus three-terminal control devices. • Think about which devices are used for AC power control and typically have two "main terminals" plus a gate.

💭 Think About

• Which answer choices describe components that normally have only two terminals? Can those match a symbol that clearly shows three connections? • Among the remaining choices, which device is known for having terminals called MT1, MT2, and a gate used to control current flow in both directions? • Does a simple rectifier or zener diode usually have a circle around its symbol and a third control lead?

✅ Before You Answer

• Verify how many leads are drawn on symbol 9 and what each is labeled; a three-terminal label is a big clue. • Eliminate any answer that refers to a device that normally has only two terminals. • Confirm from your study materials which power semiconductor uses terminal names MT1, MT2, and G for gate control of AC loads.