Electronic Principles
Waveforms are graphs that show:

amplitude on the vertical axis and the passage of time on the horizontal axis
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

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Electronic Principles
What is a free electron?

An electron that has twice the amount of charge of a normal electron
An electron that has been freed from its parent atom
An electron that has no electrical charge
An electron that costs nothing
None of these

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