🔍 Key Concepts

• Compare how bipolar junction transistors (BJTs) are drawn versus field effect transistors (FETs) in the figure set (look at symbols 1–6). • Notice the terminal labels: base/emitter/collector for BJTs, versus gate/source/drain for FETs, and anode/cathode/gate for an SCR. • Pay close attention to the direction of the arrow on the transistor symbol and what that usually indicates.

💭 Think About

• Which components in the other boxes clearly show FET-style labels (G, D, S) and which show BJT-style labels (B, C, E)? • Does the symbol in figure 1 look more like a diode with a control terminal (as in an SCR), or like a three-terminal transistor with one junction arrow? • Based on the arrow direction on the transistor leg, would current be flowing into or out of that terminal, and which BJT type normally has that arrow direction?

✅ Before You Answer

• Verify whether figure 1 uses B/C/E or G/D/S or A/K/G style labeling. • Confirm that an SCR symbol in the sheet (look at figures 9–10) always includes a diode-like shape with an extra gate lead, unlike the symbol in figure 1. • Before choosing, match the arrow direction in figure 1 with the conventional symbol for PNP vs NPN transistors in your study materials.