Electronic Principles
What is the smallest number of polarities required for current flow?

Two - a negative terminal and a positive terminal
One - a negative terminal
Three - negative, positive and neutral terminals
Four - two negative and two positive
None of these

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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
None of these
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

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