Vd V1: 4.63 4.80
Vd V2 0.66 0.68
Vd V3 5.29 5.48
Vd V4 4.72 9.50
Calculated current 10v: 10mA Calculated current 15v: 14.98mA
Describe what is happening and why you are getting these readings:
When the voltage increases all the components use the required amount of voltage to power them which leaves the remainder of the voltage to be consumed by the resistor.
In a series circuit all the voltage must be used by the end of the circuit. the zener and diode always use the same voltage to operate, the only component left to use voltage is the resister and so the volt drop varies depending on the supply.
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