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

chemical cell
piezoelectric devices
thermocouple
solar cell
None of these

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Electronic Principles
Which one of the following phrasers best describes flux density?

The force that maintains lines of force
The opposition to a build-up of magnetic fields
The concentration of lines of magnetic force
The rate of change of the number of lines of magnetic force
None of these

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Electronic Principles
The period of a waveform is:

None of these
the number of cycles completed in one second
the time required to complete one full cycle
equal to 0.707 times the peak amplitude
the time required for the voltage to rise from 10% to 90% of the peak amplitude

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