Lecture D

1. Lecture D • RC circuits • bode plots • decibels

2. What’s the impedance of a short piece of thick wire? Very large and mostly real Very large and mostly complex Very large but can be complex and/or real About zero Can’t tell with the given information

3. What’s the magnitude (i.e. ‘modulus’) of the impedance of a good voltmeter? Very large Very small Doesn’t matter. Could be either, large or small.

4. What’s the magnitude (i.e. ‘modulus’) of the impedance of a good ammeter? Very large Very small Doesn’t matter. Could be either, large or small.

5. What’s the magnitude (i.e. ‘modulus’) of the impedance of a good ammeter? Very large Very small Doesn’t matter. Could be either.

6. What’s the magnitude (i.e. ‘modulus’) of the impedance of a good voltage source? Very large Very small Doesn’t matter. Could be either.

7. What’s the magnitude (i.e. ‘modulus’) of the impedance of a good current source? Very large Very small Doesn’t matter. Could be either.

8. C5 The input impedance of most scopes is 1 MW. What voltage does the scope measure across the lower 1 MW resistor? 1MW • 0 V • 2.5 V • 3.3 V • 5 V • 7.5 V 10V 1 MW

9. C6 What voltage does the scope measure across the lower 1 MW resistor if you set the scope to 50 W impedance? 1MW • 0 V • 2.5 V • 3.3 V • 5 V • 7.5 V 10V 1 MW

10. Lab Reports: • Reports will be typically 3-6 pages in length. They must adhere to the format outlined in the syllabus. • Graphs are more helpful than long tables of numbers. You must use a computer to graph data. • Detailed error propagation is not always required. However, discussion of sources of error is necessary. • Lab reports must be clear and easy to understand by someone who has not read the lab manual.

11. Data shown with points Theory shown with lines Error bars when necessary Appropriate range Scale Axis labels with units

13. D6 Which circuit has a larger value of  = R∙C ? A B Vin,out(t) t A B) B C) They are the same. D) Impossible to tell from given information.