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If voltage is applied between terminals 1 and 2 when terminals 3 and 4 are open the power liberated is `P_(1)=40W` and when terminals 3 and 4 are connected, the power liberated is `P_(2)=80W`. If the same source is connected to the terminals 3 and 4, the power liberated in the circuit when terminals 1 and 2 are open in `P_(3)=20W`. Determine the power `P_(4)` consumed in the circuit when the terminals 1 and 2 are connected and the same voltage is applied between the terminals 3 and 4.

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