Electric Circuits
What is called the instantaneous value of an alternating current?

 The value of alternating quantity at any instant.
 The value of alternating frequency at any instant.
 The value of peak current at any instant.
 The value of peak quantity at any instant.

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Electric Circuits
A pole of driving point impedance is

 zero current for a finite value of driving voltage.
 zero voltage for a finite value of driving voltage.
 zero current for a finite value of driving current.
 zero voltage for a finite value of driving current.

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