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

chemical cell
piezoelectric devices
None of these
solar cell
thermocouple

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Electronic Principles
The north pole of a magnet is the one:

that would be attracted to the earth's south magnetic pole
that would be repelled by the south pole of another magnet
that has its molecules arranged in a random pattern
that would be attracted to the earth's north magnetic pole
None of these

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

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