Electronic Principles
Waveforms are graphs that show:

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

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Electronic Principles
Voltage is

The number of free electrons in an atom
The smallest electrically charged particle
None of these
Trie force that causes electrons to flow
The flow of charged particles through a material

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