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In ICEO, wt does the subscript ‘CEO’ mean?

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In ICEO, wt does the subscript ‘CEO’ mean?

(a) collector to base emitter open

(b) emitter to base collector open

(c) collector to emitter base open

(d) emitter to collector base open

I have been asked this question in class test.

This interesting question is from The Common Emitter Configuration in section Transistor Characteristics of Electronic Devices & Circuits

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Correct option is (c) collector to emitter base open

Easiest explanation: The subscript ‘CEO’ means that it is collector to emitter base open. It is called as the leakage current. It occurs in a reverse bias in PNP transistor. The total current can be calculated by IC=βIB+IC.

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