Which terminal is described as the voltage input in the transistor definitions?

Which terminal is described as the voltage input in the transistor definitions?

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

Answer: (A)

The input terminal is the one where the signal is applied to control the transistor’s current. For a Bipolar Junction Transistor, that control is via the base-emitter junction, so the base is the voltage input; the emitter provides the reference, and the collector is where the output current flows to the load. In a Field-Effect Transistor, the gate serves as the input that modulates the channel, while the source and drain handle the current path. So, the voltage input terminal is the base for a BJT (or the gate for a MOSFET), not the collector.

The input terminal is the one where the signal is applied to control the transistor’s current. For a Bipolar Junction Transistor, that control is via the base-emitter junction, so the base is the voltage input; the emitter provides the reference, and the collector is where the output current flows to the load. In a Field-Effect Transistor, the gate serves as the input that modulates the channel, while the source and drain handle the current path. So, the voltage input terminal is the base for a BJT (or the gate for a MOSFET), not the collector.