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Q6. A simple voltage stabilizer consists of a 1 W Zener diode and a series resistor ‘R’ as shown in Fig. The Zener diode has a breakdown voltage of 12 V and a slope resistance of 2 It requires a minimum current of 2 mA for successful stabilization. The unregulated input voltage can vary between 18 V and 24 V. Calculate EACH of the following:

(a) the minimum value of R if the input voltage is 24 V and the output current is zero;

(b) the maximum output current which can be drawn when the input voltage is 18 V if satisfactory stabilization is to be maintained;

(c) the power dissipated by the Zener diode in Q3(b).