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Q7. (a)Sketch the reverse voltage/current characteristic for a low power Zener diode with a break down voltage of 10 V. (5)

(b) Sketch a simple voltage regulator circuit using a Zener diode. (5)

(c) State which factors determine the value of series resistor used in the circuit described in Q7(b). (3)

(d) State which factors determine the power rating of the Zener diode in the circuit described in Q7(b). (3)