🔍 Key Concepts

• Basic structure of a bipolar junction transistor (BJT) • Names and roles of the three BJT terminals • Difference between transistors and display devices like LED/LCD

💭 Think About

• First, recall what a BJT physically looks like and how many connections it has. What are those connections called? • Think about what LED (light-emitting diode) and LCD (liquid crystal display) actually are used for in electronics. Are they types of transistors or something else? • In a transistor, which part is in the middle between the other two regions: the emitter, base, or collector?

✅ Before You Answer

• Verify that a BJT has exactly three terminals and recall their standard names. • Confirm whether LED and LCD are used as switching/display components or classified as transistor types. • Picture the layer order of a BJT (NPN or PNP) and identify which region lies between the other two.