Electronic Principles
Voltage is

The number of free electrons in an atom
Trie force that causes electrons to flow
The smallest electrically charged particle
None of these
The flow of charged particles through a material

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Electronic Principles
A high-pass filter:

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

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