A zener-diode voltage regulator circuit is shown below. The zener diode has breakdown voltage Vz 8.0V and the zener resistance is assumed to be 0 ohms. The power supply voltage Vps can vary between 10V and 14V and the load resistance Ri can vary between 100 ohms and 1 kohm. Vps 1. Find a value of Ri such that the zener diode remains properly biased over the range of variation of Vps and RL (hint: the minimum zener current should be greater that 0.1 times the maximum zener current) (10 points) 2. Find the maximum and minimum power dissipated in the zener diode. (5 points) 3. Find the maximum and minimum power dissipated in the entire regulator circuit