4.1 a) For the circuit shown, use the node-voltage method to find V1, V2, and i1. b) How much power is delivered to the circuit by the 15 A source? c) Repeat (b) for the 5 A source. Answer: (a) V1 = 60 V, V2 = 10 V, i1 = 10 A. (b) 900 W. (c) -50 W.
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