Consider the circuits below with the following nominal values: Vz = 6.8 V kamn) - 2 mA Input voltage = 12 *1 volts. Maximum load current is 90 mA Minimum load current is 10 mA a) Describe the operation of Circuit A. What is the function accomplished? b) Determine the value of R to always maintain the Zener turned on (Circuit A). c) Evaluate the maximum current and maximum power of the Zener (Circuit A). e) Analyze Circuit B assuming the same parameters and components used in Circuit A. Describe the operation of the circuit clearly, and use Multisim to support your arguments. Vin o Vout R Rjoad R OV out Vin Rjoad CIRCUIT B CIRCUIT A