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Question:

An npn transistor has three leads A, B, and C. Connecting B and C by moist fingers, A to the positive lead of an ammeter, and C to the negative lead of the ammeter, one finds large deflection. Then, A, B, and C refer respectively to:

Base, collector and emitter

Collector, emitter and base

Emitter, base and collector

Base, emitter and collector

Solution:

We know that the transistor is a current operated device (Beta model) and that a large current (Ic) flows freely through the device between the collector and the emitter terminals when the transistor is switched fully-ON.Therefore, A is emitter and C is collector.