Which describes the basic operation of a PNP transistor?

Which describes the basic operation of a PNP transistor?

• A. Current is injected into the Base to allow current from Emitter to Collector
• B. Current flows from Collector to Emitter regardless of base
• C. The base current controls a flow from Emitter to Base
• D. All current is applied to the Emitter, and if current is allowed to flow out of the Base, then current can flow from Emitter to Collector

Answer: (D)

In a PNP transistor, the emitter acts as the source of charge carriers. When the base-emitter junction is forward biased, carriers move from the emitter into the base, and a small base current controls a much larger current that flows from the emitter to the collector. The emitter current is effectively the source current, and the base current (allowed to flow) governs how much of that emitter current reaches the collector. That description matches the idea that all current is supplied by the emitter, and when the base current is allowed to flow, current can move from the emitter to the collector. The other statements don’t align with how a PNP transistor conducts: the base current isn’t what directly enables the main emitter-to-collector flow, and the conduction path isn’t from collector to emitter regardless of base, nor is the main conduction described as emitter-to-base flow being the controlling path.

In a PNP transistor, the emitter acts as the source of charge carriers. When the base-emitter junction is forward biased, carriers move from the emitter into the base, and a small base current controls a much larger current that flows from the emitter to the collector. The emitter current is effectively the source current, and the base current (allowed to flow) governs how much of that emitter current reaches the collector.

That description matches the idea that all current is supplied by the emitter, and when the base current is allowed to flow, current can move from the emitter to the collector. The other statements don’t align with how a PNP transistor conducts: the base current isn’t what directly enables the main emitter-to-collector flow, and the conduction path isn’t from collector to emitter regardless of base, nor is the main conduction described as emitter-to-base flow being the controlling path.