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

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

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Electric Circuits
A certain network consists of large number of ideal linear resistances, one of which is designated as R and two constant ideal source. The power consumed by R is P1 when only the first source is active and P2 when only second source is active. In both sources are active simultaneously then the power consumed by R is

 P1 ± P2 .
 (√P1 ± √P2)2.
 √P1 ± √P2.
 (P1 ± P2 )2.

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