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

Inductive reactance provides the only opposition to current flow
Resistances provide the only opposition to current flow
The ac voltage lags the current by 90 degree
Combinations of resistance and inductive reactance provide any opposition to current flow
None of these

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Electronic Principles
The peak value of a sine waveform is:

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

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