Q4. An unestablished d.c power supply whose voltage varies between 15 V and 50 V is connected to a stabilizer circuit comprising a 400 Ω resistor in series with a 8.2 V Zener diode. The Zener diode has a slope resistance of 10 Ω and requires a minimum operating current of 1 mA. The arrangement supplies a load whose current can vary between zero and 30 mA.
(a) Sketch a circuit diagram for the arrangement.
(b) Calculate EACH of the following:
(i) The load voltage when the load current is zero and the supply voltage is 15 V;
(ii) The load voltage when the load current is 30mA and the supply voltage is 40 V;
(iii) The minimum value of input voltage to give a stabilized load voltage when the load current is 30 mA;
(iv) The power dissipated in the Zener diode when the supply voltage is 50V and the output load current is 20 mA.
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