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

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

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Electronic Principles
Current is

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

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Electronic Principles
A high-pass filter:

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

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