Electronic Principles
Voltage is

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

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Electronic Principles
A low-pass filter:

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

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