# For the circuit below use the node voltage approach

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17. For the circuit below, use the node-voltage approach to find the power being dissipated in each of the resistors. In the circuit, I S1 = 0.2 A, V S = 12 V, I S2 = 0.4 A R 1 = 200 Ω , R 2 = 100 Ω , R 3 = 500 Ω , R 4 = 150 Ω , and R 5 = 50 Ω . + R 1 R 2 R 3 R 4 R 5 I S1 I S2 V S P R1 = ______________________ ; P R2 = ______________________ P R3 = ______________________ ; P R4 = ______________________ P R5 = ______________________

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18. For the circuit below, find the value of I S so that the power being dissipated in R 4 is 45 mW. (Suggestion: Write the node-voltage equations for the circuit as you normally would, and then use the power specification above to work backwards towards finding the required value for I S .) For the circuit, V S = 35 V, R 1 = 5 k Ω , R 2 = 10 k Ω , R 3 = 5 k Ω , R 4 = 5 k Ω . + V S I S R 1 R 2 R 3 R 4 I S = ___________________________________________
19. Use the node-voltage method to find voltages at each of the nodes in the circuit below. Choose one node to be ground. (Choose carefully!) Of course, its voltage will be 0. Find the voltages of the other nodes with respect to the ground you have chosen. For the circuit, I S1 = 20 mA, V S = 15 V, I S2 = 5 mA R 1 = 1 k Ω , R 2 = 2 k Ω , R 3 = 3 k Ω , R 4 = 4 k Ω , R 5 = 5 k Ω , and R 5 = 6 k Ω . + I S1 I S2 R 1 R 3 R 4 R 2 R 5 R 6 V S a b c d e v a = ____________________ ; v b = ____________________ ; v c =__________________ v d = ______________________ ; v e = ______________________
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