Electronic Principles
Current is

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

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Electronic Principles
Molecule is

A atom that flows whenever there is an imbalance of electrical charges between two points
A atom that has an excessive number of electrons in its outer orbit
The smallest particle of a substance that retains the properties of that substance
A atom that has a shortage of electrons in its outer orbit
None of these

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Electronic Principles
A low-pass filter:

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

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