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?

28.4 mA
24.2 mA
68.4 mA
34.4 mA
None of these

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Electronic Principles
Which one of the following phrases best describes residual magnetism?

The force of attraction between the poles of a permanent and temporary magnetic field
Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
The amount of magnetic flux that is not confined to the core material of an electromagnet
None of these
The circular magnetic field that surrounds a conductor carrying a current

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Electronic Principles
What is a negative ion?

An atom that contains more electrons than neutrons
None of these
An atom that contains more electrons than protons
An atom that contains more protons than electrons
An atom that contains more protons than neutrons

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