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The current which is helpful for LED to turn on is_________(a) emitter current(b) base current(c) collector current(d) depends on biasThe question was posed to me during an interview for a job.Query is from Transistor as a Switch topic in section Transistor Characteristics of Electronic Devices & Circuits

Answer»

Correct option is (c) collector current

The EXPLANATION is: Depending on the type of load, a collector current is induced that would turn on the MOTOR or LED. The transistor in the circuit is SWITCHED between cut off and saturation. The load, for example, can be a motor or a LIGHT emitting diode or any other electrical device.



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