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Two electrical devices are connected as shown in given Figure. Using the reference marks shown in the figure, find the power transferred and state whether the power is transferred from A to B or B to A when

(a) v = +12 V and i = -1:2 A

(b) v = + 80 V and i = + 10 mA

(d) v = -15 V and i = -300 μA

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