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

thermocouple
solar cell
electric device
chemical cell
None of these

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Electronic Principles
Waveforms are graphs that show:

frequency on the vertical axis and amplitude on the horizontal axis
the passage of time on the vertical axis and amplitude on the horizontal axis
amplitude on the vertical axis and frequency on the horizontal axis
None of these
amplitude on the vertical axis and the passage of time on the horizontal axis

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