how does the current Ib influence the thickness of the depletion layer?

If you are going to consider this question you need to specify conditions.

It would be interesting for me to learn which examples you are referring to.

Well I can turn the valve that controls a 5m high pressure water main by hand.
Yet my power is puny compared to that within the main.

An electrical example might be electrostatic deflection of an electron beam.

A mechanical example might be changing course using side thrust rockets, small compared to the main drive.

There is nothing wrong with Ebers Moll or even more sophisticated models but they are still models and only tell part of the story. It really depends upon what you wish to calculate.

The 'get you started' introduction to how the BJT works is not the biggest problems the E-Book faces. Don't also forget the wide variety of audience backgrounds it is aimed at.

Would you be comfortable if I said "actually if you want physical reality you need to start calculating the molecular orbitals and conduction bands, rather than using intermediate variables like curent and voltage."
Would that help a learner?

 

I think the OP has understood the difficulties in changing the e-book paragraph content. No further discussion on Feedback is needed. If you want to discuss semiconductor theory, you are free to do so in General Electronics Chat.

This thread has served its purpose and will now be closed.