Electric Circuits
You have to replace 1500 Ω resistor in radio. You have no 1500 Ω resistor but have several 1000 Ω ones which you would connect

 three in series.
 two in parallel and one in series.
 two in parallel.
 three in parallel.

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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.
 (√P1 ± √P2)2.

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