Electronic Principles
Voltage is

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

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Electronic Principles
A low-pass filter:

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

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