Electrical circuits homework Multisim

ELEC 210: Electric Circuit Analysis Homework #7

Due: June 16, 2014

1. Complete Multisim Tutorial 3. You will find the Oscilloscope and Current Probe instruments in the Simulate menu. To save on ink, click Reverse on the oscilloscope output window. Cut and paste your circuit diagram and oscilloscope output into a document.

2. Determine 𝑣𝑐(𝑡), 𝑡 > 0 for the circuit shown in Figure 1. Assume the switch opens at t=0 after being closed for quite some time. Use the five step approach discussed in class. Clearly number each step. Box your answer.

3. Plot 𝑣𝑐(𝑡) from problem 2 in Excel for 𝑡 ≥ 6𝜏. Pick a time interval small enough to produce an informative curve. Use the XY scatter option with smooth lines and no data points. Delete the legend if one is created, and title your chart using the figure number. Title and label axes appropriately, showing units. Cut and paste chart into the document started in problem 1.

4. Simulate the opening of the switch in Multisim, using the oscilloscope to show 𝑣𝑐(𝑡).

Use the switch you learned about in the tutorial instead of the switch shown in the figure. Since you are measuring voltage, you don’t need a current probe. Pick your time interval such that you can show a complete discharging cycle on the oscilloscope display. Cut and paste your circuit diagram and oscilloscope output into your document. When you print your final work, estimate the time constant from the oscilloscope output. This will be a very rough estimate, but show me how you reached your answer. Compare this to your hand calculations.

5. Repeat 2-4 for the circuit shown in Figure 2. Determine, plot and simulate 𝑖𝐿(𝑡), 𝑡 >

0. Again assume the switch opens at t=0 after being closed for quite some time.

Figure 1 Figure 2

Organize all figures in your document, numbering the work from each problem and referencing the figure number; crop and resize in order to fit all work on 2-3 pages. Print. Don’t forget – homework is to be single-sided and stapled.