4.47 A zener diode is rated for 3-V operation at 5 mA with an incremental resistance of 100 Ω. It is connected to a voltage source VS through a 1- kΩ resistor. What is the maximum voltage VS that can be applied without exceeding the zener’s maximum power rating of 40 mW? What is the voltage across the zener under this condition?
14.71 V; 3.61 V