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?

68.4 mA
None of these
28.4 mA
24.2 mA
34.4 mA

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Electronic Principles
The period of a waveform is:

None of these
equal to 0.707 times the peak amplitude
the number of cycles completed in one second
the time required to complete one full cycle
the time required for the voltage to rise from 10% to 90% of the peak amplitude

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