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The current which is helpful for LED to turn on is_________

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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 bias

The 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

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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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