Electrical and Computer Engineering Homework Solutions

DOMAIN EXPRESSION

Could you show me how to solve question 6 on the attached file? Assume that op amp is ideal.

rms current

A personal computer that has a built in monitor and keyboard requires 40W at 115V(RMS). What is the rms value of the current carried by the power cord?Can you show me how to solve this problem?

Total Resistance

Derive formulae for the total resistance of three resistors R1=20kΩ, R2=4.7kΩ and R3=10kΩ when connected in series and also in parallel.

Resistor Transfer Characteristics

Write a Matlab script to plot the transfer characteristics of a resistor as shown in Fig. 1.1 (step 10) with V=1V and R=1kΩ. (Use these commands, R=1000; V=[0: 0.1:1]; I=V/R; plot(V-I)). Are these graphs are identical? (See attached file for full problem description)

Voltage across Wheatstone Bridge

Derive the formula to find the voltage across the terminals AB of a Wheatstone Bridge as shown in Fig.1.2 (see attached file) and then calculate the actual value with the components as shown. See attached file for full problem description.

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.

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