In an NPN transistor, applying base current controls current flow from which terminal to which?

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Multiple Choice

In an NPN transistor, applying base current controls current flow from which terminal to which?

Explanation:
The main idea is that a transistor acts as a current amplifier: a small current into the base controls a much larger current flowing between the other two terminals. In an NPN transistor operating in forward-active mode, the base-emitter junction is forward biased, so carriers are injected from the emitter into the base. Because the base-collector junction is reverse biased, most of those carriers are swept into the collector, creating a collector current that is proportional to the base current (I_C ≈ β I_B). This means the base current acts as a gate for the larger current from the collector toward the emitter. Therefore, the current path that is controlled by the base is from the collector to the emitter. The base-to-collector current is minimal in this mode, and the emitter-to-base path is not the main current flow in normal operation.

The main idea is that a transistor acts as a current amplifier: a small current into the base controls a much larger current flowing between the other two terminals. In an NPN transistor operating in forward-active mode, the base-emitter junction is forward biased, so carriers are injected from the emitter into the base. Because the base-collector junction is reverse biased, most of those carriers are swept into the collector, creating a collector current that is proportional to the base current (I_C ≈ β I_B). This means the base current acts as a gate for the larger current from the collector toward the emitter. Therefore, the current path that is controlled by the base is from the collector to the emitter. The base-to-collector current is minimal in this mode, and the emitter-to-base path is not the main current flow in normal operation.

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