Lecture D RC circuits bode plots decibels

What’s the impedance of a short piece of thick wire? A) Very large and mostly real B) Very large and mostly complex C) Very large but can be complex and/or real D) About zero E) Can’t tell with the given information

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

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

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

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

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

C5 A)0 V B)2.5 V C)3.3 V D)5 V E)7.5 V 10V 1M  The input impedance of most scopes is 1 M . What voltage does the scope measure across the lower 1 M  resistor?

C6 A)0 V B)2.5 V C)3.3 V D)5 V E)7.5 V 10V 1M  What voltage does the scope measure across the lower 1 M  resistor if you set the scope to 50  impedance?

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. Lab Reports:

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

D1 What is V A for the Wheatstone bridge? A) E) D) B) C)

D2 A)Yes, it is easy to do. B)Yes, but only if you are very careful C)No Using only the Wheatstone bridge can you accurately determine the value of resistor R x ?

Noise is at a different frequency than the signal

What is the differential equation for the current through the circuit? (time derivative of the loop equation) (Hint: I = dq/dt) A) B) C) D) E) Current 45 D3

D4 A)0 B)q/c C)V/R D)1/(RC) E)Near infinite What is I 0 (I at t = 0)?

D5 What is the voltage across the capacitor 100 ms after the switch is closed? A)Zero B) 3.7 V C) 5 V D) 6.3 V E) 10 V

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