In an automobile car, there is an adaptor that converts voltage from 12 volts to 5 volts for smart phone charging system. The adaptor consists of a zener diode with nominal voltage of 5.1 volts. The specification is given as: IZT = 20 mA, ZZT = 17 Ω, IZK = 0.25 mA, dan IZM = 40 mA. a. [5 points] Calculate maximum voltage that can be produced by the zener. b. [5 points] Calculate minimum R that prevents current on the zener excessive. c. [5 points] Calculate voltage on the zener when the power on load is maximum. d. [5 points] Calculate allowed maximum load power so that the voltage on the zener is not drop.