Electronic Principles
The rise time of a pulse waveform is the time required for the voltage to rise:

None of these
from zero to its rms value
from 10% of the peak value to 70.7% of the peak value
from 10% of the peak value to 90% of the peak value
from zero to its peak value

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Electronic Principles
Which one of the following statements most accurately reflects the nature of ac power?

The current in an ac circuit flows in two directions at the same time
None of these
The current in an ac circuit flows in one direction at a steady level
The current in an ac circuit flows in one direction, but changes value periodically
The current in an ac circuit changes direction periodically

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Electronic Principles
The south pole of a magnet is the one:

None of these
that would be repelled by the north pole of another magnet
that would be attracted to the earth's south magnetic pole
that would be attracted to the earths north magnetic pole
that has its molecules arranged in a random pattern

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