Electric Circuits
Two resistances R1 and R2 give combined resistances 4.5 Ω and 1 Ω when they are connected in series and parallel respectively. What would be the values of these resistances?

  1.5 Ω and 3 Ω.
 6 Ω and 9 Ω.
 3 Ω and 9 Ω.
  3 Ω and 6 Ω.

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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 )2.
 P1 ± P2 .
 √P1 ± √P2.

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