🔍 Key Concepts

• Focus on symbols 1 and 2 only; they are the bipolar junction transistor (BJT) symbols in this illustration. • Remember that in a BJT, the emitter lead is the one with the arrow, and the arrow direction distinguishes NPN vs PNP. • Use the electronics mnemonic: "NPN = Not Pointing iN" (so the other direction corresponds to PNP).

💭 Think About

• Which of the symbols clearly shows three leads labeled as base, collector, and emitter (or similar), rather than gate, source, or drain? • On those BJT symbols, look at the arrow on the emitter: which one has the arrow pointing into the transistor body instead of out? • Once you identify which direction corresponds to NPN using the mnemonic, which remaining symbol must then represent PNP?

✅ Before You Answer

• Confirm that the symbol you choose has terminals labeled B (base) and C (collector); PNP and NPN BJTs both must have these. • Verify that the emitter is the lead with the arrow, and that for PNP the arrow points toward the transistor body. • Make sure you are not selecting a FET symbol (gate, source, drain labels such as G, D, S indicate it is not a BJT).