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The figure represents a voltage regulator circuit using a Zener diode. The breakdown voltage of the Zener diode is 6 V and the load resistance is, R L = 4k Ω . The series resistance of the circuit is R i = 1 k Ω . If the battery voltage V B varies from 8 V to 16 V, what are the minimum and maximum values of the current through Zener diode? V B R i R L →

1. 0.5 mA; 8.5 mA
2. 1.5 mA; 8.5 mA
3. 1 mA; 8.5 mA
4. 0.5 mA; 6 mA

Correct answer: 0.5 mA; 8.5 mA

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