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?

34.4 mA
None of these
68.4 mA
28.4 mA
24.2 mA

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Electronic Principles
Which one of the following phrasers best describes flux density?

The concentration of lines of magnetic force
The force that maintains lines of force
The opposition to a build-up of magnetic fields
None of these
The rate of change of the number of lines of magnetic force

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