Electric Circuits
If all the elements in a particular network are linear, then the superposition theorem would hold, when the excitation is

 DC only
 An Impulse
 Either AC or DC
 AC only

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

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

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