Problem:
A concealed circuit consisting of resistors has four terminals as shown in fig. If a voltage is applied between clamps 1 and 2 when 3 and 4 are disconnected power liberated is P_{1}= 40 W. When clamps 3 and 4 are connected P_{2}= 80 W. If the same source is connected to the clamps 3 and 4, the power liberated when 1 and 2 are disconnected P_{3}= 20 W. Determine the power P_{4} with 1 and 2 shorted with the same source applied between 3 and 4.
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