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1. An unloaded zener regulator has a source voltage of 20 V, a series resistance of 330 W, and a zener voltage of 12 V, What is the Zener current?
(A): 24.2 mA
(B): 28.4 mA
(C): 34.4 mA
(D): 68.4 mA
(E): None of the above
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