Electronic Principles
What form of energy is used to maintain an imbalance of charges between the terminals of a battery?

None of these
Mechanical energy
Solar energy
Chemical energy
Electronical energy

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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
has no effect on ac signals
increases the level of all frequencies by a significant amount

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