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A 5.1 V Zener regulator is connected to a 12 V supply through a 690 ohm series resistor. Neglecting load current, the Zener current is approximately?

A5 mA
B10 mA
C17.4 mA
D24.8 mA

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Correct Answer: B. 10 mA

Explanation: IZ = (12 - 5.1)/690 = 6.9/690 = 0.01 A = 10 mA.

Reference: Standard electronics: Zener regulator calculation

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