Electrical and Computer Engineering Homework Solutions

Kirchhoff's Current Law

Use Kirchhoff's current law to determine the unknown currents in the circuit in Figure 2.7 (attached). Thanks.

Supplying and Dissipating Power

Determine which elements in the circuit of Figure 2.10 (attached file) are supplying power and which are dissipating power. Also, determine the amount of power dissipated and supplied.

Simple Circuit

In the circuit of Figure 2.17 (see attached file), if v1=v/4 and the power delivered by the source is 40 mW, find R, v, v1, and i. Given: R1=kilo-ohms, R2=10 kilo-ohms, and R3=12 kilo-ohms. Please show your steps. Thanks.

Sign Convention

Refer to Figure 2.16 (see attached file): a) Find the total power supplied by the ideal source. b) Find the power dissipated and lost within the nonideal source. c) What is the power supplied by the source to the circuit as modeled by the load resistance? d) Plot the terminal voltage and power supplied to the circuit as a fu ...continues

Wheatstone Bridge

Find equivalent resistance of circuit (see attachment) by using the Tee-Pi conversion. See attached file for full problem description.

Current, Power and Total Power

For the circuit shown in Figure 2.24 (attached file), find: a) The currents i1 and i2. b) The power delivered by the 3-A current source and by the 12-V voltage source. c) The total power dissipated by the circuit. Let R1=25 ohms, R2= 10 ohms, R3= 5 ohms, R4= 7 ohms, and express i1 and i2 as functions of v. (Hint: Apply KCL ...continues

Current Electricity: Kirchhoff and Ohms law, DC circuit

Use Kirchhoff's current law and Ohm's law to determine the current in each of the resistors R4, R5, and R6 in the circuit of Figure 2.31 (see attached file). Vs= 10 V, R1= 20 ohms, R2= 40 ohms, R3= 10 ohms, R4=R5=R6= 15 ohms.

Voltage Divider Circuit

The voltage divider network of Figure 2.37 (attached file) is expected to provide 5 V at the output. The resistors, however, may not be exactly the same; that is, their tolerances are such that the resistances may not be exactly 5 kΩ. a) If the resistors have ± 10 percent tolerance, find the worst-case output voltages. ...continues

Equivalent Resistance

For the circuit shown in Figure 2.42 (attached file), find: a) The equivalent resistance seen by the source. b) The current through and the power absorbed by the 90-Ω resistance. Given Vs= 110 V, R1= 90 Ω, R2= 50 Ω, R3= 40 Ω, R4= 20 Ω, R5= 30 Ω, R6= 10 Ω, R7= 60 Ω, R8= 80 Ω.

Voltage

Determine the voltage across R3 in Figure 2.51 (see attached file). Vs = 12 V R1 = 1.7 mΩ R2 = 3 kΩ R3 = 10 kΩ

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