Which transistor terminal carries the main output current in normal operation?

Which transistor terminal carries the main output current in normal operation?

• A. Base
• B. Gate
• C. Collector
• D. Emitter

Answer: (C)

The main current path in a transistor is between the collector and emitter, while the base provides the small control current. In normal operation, the collector current is the larger, output-serving current because it is amplified by the transistor (I_C is roughly β times I_B). The emitter current is the sum of base and collector currents (I_E = I_B + I_C), so it isn’t the primary output in typical configurations. The base is just the control input, and the gate is a control terminal in MOSFETs, not the main load-carrying path. Therefore, the terminal that carries the main output current is the collector.

The main current path in a transistor is between the collector and emitter, while the base provides the small control current. In normal operation, the collector current is the larger, output-serving current because it is amplified by the transistor (I_C is roughly β times I_B). The emitter current is the sum of base and collector currents (I_E = I_B + I_C), so it isn’t the primary output in typical configurations. The base is just the control input, and the gate is a control terminal in MOSFETs, not the main load-carrying path. Therefore, the terminal that carries the main output current is the collector.