1. The problem statement, all variables and given/known data The whole image is at here http://imgur.com/a/Dcbvv , but I will try to elaborate more. I have a 12V fixed source with an RS of 220 Ohms with a 1N4733 zener diode model connected and a varying load parallel to the diode. Find the Source Current, Z current, Voltage at R1, and Load Current. We haven't done the experiment yet so we're only doing the computed values for now. However I have doubts on what my groupmates have computed here.Their results are written in the table on the imgur link. While my computations are written on the left side of it 2. Relevant equations IS = IZ + IL Where the Source is fixed, IS= (VS - Zener voltage) / RS 3. The attempt at a solution I did the solution on the left side of the imgur image but I will also write it down again. Using equation 2, (12V-5V)/220Ohms = 31.82mA. Which should be the constant IS. Using IS = IZ + IL, I have 31.82 = IZ + 5 mA for 1K resistor which should yield IZ = 26.82mA. The rest have the same logic but I also have a problem with the VR1, should I assume it to be equal to 5V of the Zener Diode?