Electronic Principles
Current is

An imbalance of electrical charges
The flow of charged particles through a material
The number of free electrons in an atom
None of these
The force that causes electrons to flow

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Electronic Principles
Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?

The voltage reverses polarity periodically
The voltage remains at one polarity and at a steady level
None of these
The voltage causes current to flow in two directions at the same time
The voltage remains at one polarity but changes value periodically

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Electronic Principles
Waveforms are graphs that show:

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

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