Electronic Principles
Which one of the following principles best describes the basic operation of a generator?

Like magnetic poles repel; unlike poles attract
Like magnetic poles attract; unlike poles repel
Current is induced in a conductor that is moving through a magnetic field
None of these
Current flowing through a conductor generates a magnetic field

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Electronic Principles
A low-pass filter:

reduces the level of all frequencies by a significant amount
passes higher-frequency signals and reduces lower-frequency signals
has no effect on ac signals
None of these
passes lower-frequency signals and reduces higher-frequency signals

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Electronic Principles
Current is

The number of free electrons in an atom
An imbalance of electrical charges
None of these
The flow of charged particles through a material
The force that causes electrons to flow

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