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

from zero to its peak value
from 10% of the peak value to 70.7% of the peak value
from zero to its rms value
None of these
from 10% of the peak value to 90% of the 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 one direction, but changes value periodically
The current in an ac circuit flows in two directions at the same time
The current in an ac circuit flows in one direction at a steady level
None of these
The current in an ac circuit changes direction periodically

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