🔍 Key Concepts

• Difference between bipolar junction transistors (BJT) and field effect transistors (FET) symbols • How a JFET (junction field-effect transistor) symbol shows the gate, source, and drain without an insulated gate oxide • How extra leads like a substrate/body (Sub) terminal usually indicate a MOSFET rather than a JFET

💭 Think About

• First, identify which numbered symbols clearly show a BJT (base, collector, emitter) and eliminate those choices. • Then, among the remaining FET-looking symbols, decide which one represents a JFET by looking for a gate that is directly connected to the channel (a PN junction), not separated by insulation. • Check whether the symbol includes a separate substrate/body terminal; ask yourself which FET type typically exposes that as a separate lead.

✅ Before You Answer

• Verify which symbols are labeled with B, C, E (base, collector, emitter) – those are BJTs, not JFETs. • Among the FET symbols, look for the one that has only three terminals labeled G, D, and S, with no extra Sub (substrate) lead. • Confirm that the gate in the correct symbol appears to form a junction directly into the channel, rather than being drawn as an insulated plate as in a MOSFET.