What is the status of the NPN transistor when the output voltage is zero volts?

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Multiple Choice

What is the status of the NPN transistor when the output voltage is zero volts?

When the output is zero volts, the NPN transistor is being driven on and pulling current through from collector to emitter. That state is described as energized—the device is receiving base current and actively conducting. In typical switch circuits, this on state often corresponds to the transistor operating in saturation, where it is fully on and the output sits near ground. If it were not conducting, the output would stay high instead of at zero. The term “conducting” is true, but the emphasis here is on the active, energized condition caused by the input drive; saturation is the technical condition of being fully on, but the question’s wording focuses on the energized/on status.

When the output is zero volts, the NPN transistor is being driven on and pulling current through from collector to emitter. That state is described as energized—the device is receiving base current and actively conducting. In typical switch circuits, this on state often corresponds to the transistor operating in saturation, where it is fully on and the output sits near ground.

If it were not conducting, the output would stay high instead of at zero. The term “conducting” is true, but the emphasis here is on the active, energized condition caused by the input drive; saturation is the technical condition of being fully on, but the question’s wording focuses on the energized/on status.

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