HW _4 Solutions - Apply nodal analysis to determine the...

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Problem 3.5 Apply nodal analysis to determine the voltage V R in the circuit of Fig. P3.5. 2 Ω 4 Ω 4 Ω 8 V V R + _ 12 V + _ _ V Figure P3.5: Circuit for Problem 3.5. Solution: At node V : V 12 4 + V 2 + V 8 4 = 0 , which leads to V = 5 V . Hence, V R = 12 V = 12 5 = 7 V .
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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? 2 Ω 8 Ω 8 Ω 8 Ω 8 Ω 6 V 3 A 4 A I + _ V I Figure P3.8: Circuit for Problem 3.8. Solution: (a) At node V : V 6 2 + V 8 + V 8 + 3 = 0 , which leads to V p 1 2 + 1 8 + 1 8 P = 3 3 = 0 6 V 8 = 0 . Hence, V = 0 , and I = V 8 = 0 also . (b) I = V 6 2 = 0 6 2 = 3 A . P = VI = 6 × ( 3 ) = 18 W (c) None.
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This note was uploaded on 06/15/2011 for the course EE 302 taught by Professor Mccann during the Fall '06 term at University of Texas at Austin.

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HW _4 Solutions - Apply nodal analysis to determine the...

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