Electronic Principles
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?

24.2 mA
34.4 mA
28.4 mA
None of these
68.4 mA

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Electronic Principles
In a pure inductor:

ac current leads the voltage by 90 degree
ac current and voltage are exactly in phase
None of these
ac current lags the voltage by 90 degree
ac current is converted to dc voltage

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