# Notes 19 October 2004 Clearer scanned op-amp summary

Notes 19 October 2004 Clearer scanned op-amp summary drawings are now on web site. along with the example of using a voltage follower in a sample-and-hold circuit. Midterm 1 results: Mean 69/100; standard deviation 14.4; high 100; low 24. See Grading on the Curve on web site to interpret. interpretation Histogram F re q u e n c y 35 30 25 20 Frequency 15 10 5

0 Bin Points to note from midterm answers 1. The current flowing in a resistor is the same everywhere (a result of KCL); the potential energy of the charge carriers decreases as they go from + to end. 2. Put a voltmeter across an element to measure voltage drop. 3. Linear circuit elements have straight-line I-V plots. Linear elements are: ideal resistors, capacitors and inductors; and voltage and current sources. 4. Resistors dissipate energy (they may get hot!) as can voltage sources if current is forced into the + voltage terminal. Ideal capacitors and inductors store, but do not dissipate, energy. 5. The voltage between the terminals of an ideal current source need not be zero it can be any value that is compatible with the value of the current and the circuit it is in. 6. Do not turn off a dependent source when doing superposition analysis.

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