How do I determine the voltage across R2 in this circuit?

by ElectronicStudent42   Last Updated September 12, 2019 00:25 AM

Does the position of the zener matter? I thought that entire left branch would have 20V across it, and from there it would be 20V - 8.2V = 11.8V left to be split between R1 and R2 using voltage divider. This does not appear to be the case though according to CircuitLab. The zener has 8.2V across it and the majority of the remainder is across R1 and I am stumped as to why. How do I determine the voltage across R2? Why does R2 not have the majority of the remaining voltage if it is the bigger resistance?

CircuitLab says that there is about 0.7V across R2, which just so happens to be the voltage typically found across Vbe on a BJT. This voltage is necessary for the transistor to function properly? That's the best that I've got right now.

Tags : bjt zener homework

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