Electronic Principles
Current and voltage are said to be in phase when:

All of these
their waveforms cross through zero and reach positive and negative peaks at the same time
None of these
they have the same amplitude and frequency
their waveforms are both ac or both dc

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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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