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Problem 3.8 For the circuit in Fig. P3.8: (a) Determine I. (b) Determine the amount of power supplied by the voltage source. (c) How much influence does the 4-A source have on the circuit to the left of the 3-A source? I‘ 3A V I 2Ω 6V 8Ω + _ 8Ω 8Ω 8Ω 4A Figure P3.8: Circuit for Problem 3.8. Solution: (a) At node V : V −6 V V + + + 3 = 0, 2 8 8 which leads to V 1 1 1 + + = 3−3 = 0 2 8 8 6V = 0. 8 Hence, V = 0, and I = V = 0 also. 8 (b) V −6 0−6 = = −3 A. 2 2 P = V I = 6 × (−3) = −18 W I′ = (minus sign confirms that voltage source is a supplier of power). (c) None. c All rights reserved. Do not reproduce or distribute. 2013 National Technology and Science Press