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

None of these
solar cell
photodiode
nicad cell
piezoelectric device

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

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

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