Electronic Principles
What is the difference between a conductor and an insulator?

A conductor allows current to flow much easier than an insulator does
The difference between conductors and insulators depends on how they are used
An insulator allows current to flow much easier than a conductor does
None of these
An insulator has an excessive number of free electrons, while a conductor has a few free electrons or none at all

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Electronic Principles
A low-pass filter:

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

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

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

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