Since we do not have the value of series resistance, assume it is R.
1) Calculate the currents flowing through the series resistance:
ISmax=(Vmax−VZ)/RS=70/RS.
ISmin=(Vmin−VZ)/RS=30/RS.
2) The series current can be represented as a sum of zener current and the load current:
IS=IZ+IL.
3) Calculate the load current in zener diode:
IL=VZ/RL=50/10000=0.005 A. 4) The maximum and minimum zener diode currents are
IZ=IS−IL,
IZmax=70/RS−0.005,
IZmin=30/RS−0.005.
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