Unit 1 Review Problems_F07

Unit 1 Review Problems_F07 - Power Calculations 1. Find the...

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Power Calculations 1. Find the power produced or absorbed by each source. 60 V 2 A 80 V 5 A 100 V Answer: Source Power Absorbed or Delivered? 2A 320.W Absorbed 60V 120.W Delivered 80V 400.W Absorbed 5A 900.W Delivered 100V 300.W Absorbed 2. If the connection is valid, find the total power developed in the circuit. 50 V 30 I Δ 80 V 5 A 200 V I Δ 2 A Total Power delivered = 1.00kW 3. The following circuit satisfies Kirchhoff's Laws. Find the total power dissipated if V 0 =100V. 4 A I Δ i g 60 V 80 V 2 I Δ + v 0 - Total Power dissipated = 2.24 kW 4. Calculate the power being delivered by the dependent source in the circuit below 6 Ω 0.9I x i x 3 Ω 6 Ω 15 Ω 9 Ω 6 A 4 A Dependent source power = 30.0 W delivered
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5. Calculate the total power delivered and absorbed by each element in the circuit below. Clearly state whether each element is absorbing or delivering power. 20 V 20 Ω 5I 2 V 1 /4 5 Ω I 2 + v 1 - I 1 I 3 I 4 + V x - Element Voltage Current Power Is power delivered or absorbed? 20 V source 20 Ω resistor Dependent source 5i 2 Dependent source v 1 /4 5 Ω resistor Answers: Element Voltage Current Power Is power delivered or absorbed? 20 V source V 1 = 20.0 V I 1 = 9.00 A - 180. W 180. W delivered 20 Ω resistor V 1 = 20.0 V I 2 = 1.00 A 20.0 W 20.0 W aborbed Dependent source 5i 2 5.00 V I 3 = 8.00 A 40.0 W 40.0 W absorbed Dependent source v 1 /4 Vx = 15V 5.00 A 75.0 W 75.0 W absorbed 5 Ω resistor Vx = 15V I 4 = 3.00 A 45.0 W 45.0 W absorbed Design Problems 6. Find R 1 and R 2 such that V 0 = 5V and the power dissipated in R 1 is 0.25W. 25 V 150 Ω R 2 R 1 R 1 + V 0 - R1 = 100. Ω R2 = 200. Ω
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7. The circuit below is a voltage divider circuit designed to produce three voltages for use in other circuits. Calculate R 1 , R 2 , and R 3 in order to produce no-load voltages of 12V, 6V, and -12V and under the constraint that the total power dissipated is 36W. 24 V R 2 R 1 R 3 8. Specify the resistors in the following circuit to meet the following design criteria: Ig = 8 mA, Vg = 4 V, I 1 = 2I 2 , I 2 =10I 3 , and I 3 =I 4 .
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This note was uploaded on 11/05/2008 for the course EE 302 taught by Professor Mccann during the Spring '06 term at University of Texas at Austin.

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Unit 1 Review Problems_F07 - Power Calculations 1. Find the...

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