Zener Diode Voltage Regulator Is Shown In Fig. 29 35

A zener diode voltage regulator is shown in Fig. 29-35. Suppose that R = 1.80kΩ and that the diode breaks down at a reverse voltage of 130V. (The current increases rapidly at this point, as shown on the far left of Fig. 29-28 at a voltage of – 12V on that diagram). The diode is rated at a maximum current of 120mA.
(a) If Rload = 15.0kΩ, over what range of supply voltages will the circuit maintain the output voltage at 130V?
(b) If the supply voltage is 200V, over what range of load resistance will the voltage be regulated?

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