Electronic Principles
Current is

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

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Electronic Principles
The peak value of a sine waveform is:

the maximum positive or negative value
the amplitude at 90% of the maximum value
None of these
the amplitude at 70.7% of the maximum value
the amplitude at 1.41 times the maximum value

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