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

Chemical energy
Electronical energy
None of these
Mechanical energy
Solar energy

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Electronic Principles
A low-pass filter:

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

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Electronic Principles
Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?

None of these
The voltage remains at one polarity but changes value periodically
The voltage reverses polarity periodically
The voltage remains at one polarity and at a steady level
The voltage causes current to flow in two directions at the same time

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