Electric Circuits
A series circuit consists of R = 20 Ω, L = 20 mH, and AC supply 60 V with f = 100 Hz. The phase angle of current in respect of supply voltage will be

 20.2o.
 32.1o.
 40.4o.
 28.8o.

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

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