Electric Circuits
Three element having conductance G1, G2 and G3 are connected in parallel. Their combined conductance will be

 1 / G1 + 1 / G2 + 1 / G3.
 (G1 + G2 + G3) - 1.
 G1 + G2 + G3.
 (1 / G1 + 1 / G2 + 1 / G3) - 1.

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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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