Electronic Principles
Waveforms are graphs that show:

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

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Electronic Principles
Which one of the following phrases most accurately describes a purely capacitive circuit?

Resistances provide the only opposition to current flow
The ac voltage leads the current by 90 degree
Combinations of resistance and capacitive reactance provide any opposition to current flow
Capacitive reactance provides the only opposition to current flow
None of these

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