Explain what is happening here and why: The Voltage for V1 and V3 is at or around 5V because the Zener diode is acting as a 5V regulator. V2 is reading as it should as the diode will drop 0.7V.
V4 is highest at 15V because its coming in before the diode and so takes the most of the voltage.
27/10/10 Correction for V4: Increasing the voltage will therefore increase the resistance at V4 resulting in a higher voltage being read at the resistor.
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