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

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

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

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

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