Electronic Principles
Voltage is

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

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Electronic Principles
A low-pass filter:

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

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Electronic Principles
Which one of the following phrases most accurately describes a purely capacitive circuit?

None of these
The ac voltage leads the current by 90 degree
Capacitive reactance provides the only opposition to current flow
Resistances provide the only opposition to current flow
Combinations of resistance and capacitive reactance provide any opposition to current flow

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