Electronic Principles
A device that converts mechanical pressure to electrical energy is called a:

nicad cell
None of these
solar cell
piezoelectric device
photodiode

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Electronic Principles
A high-pass filter:

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

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Electronic Principles
What is a negative ion?

None of these
An atom that contains more electrons than protons
An atom that contains more protons than neutrons
An atom that contains more protons than electrons
An atom that contains more electrons than neutrons

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