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Need to find VR1 and VR2 in the circuit when: A) D1: forward D2: forward B) D1: reverse D2: forward C) D1: forward D2: reverse D) D1: reverse D2: reverse. Show calculations. E=9v R1=10kohms R2= 4.7kohmsenter image description here

enter image description here I calculated 8.3v for VR1 but I don't know how to calculate VR2. The right side of the chart shows what I got from the meter when I built the circuit.

Aleysha Camacho
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  • Write a KVL equation for the outer loop (E, VD1, VR1, and VD2) for your first case. This will show you the missing piece for case 1. – relayman357 Oct 01 '20 at 15:20

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Depending on the accuracy needed, you can assume the forward voltage drop across a diode is 0.7 V and in reverse bias it is an open circuit.

Increased accuracy would require iterating with the diode equation for a more exact solution.

relayman357
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  • Comments are not for extended discussion; this conversation has been [moved to chat](https://chat.stackexchange.com/rooms/113673/discussion-on-answer-by-relayman357-diodes-practical-analysis). – Voltage Spike Oct 02 '20 at 19:53
  • @VoltageSpike Thanks. Appropriate. – jonk Oct 02 '20 at 20:09