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Lectures
Lecture: 24 (iq22)
Microscopic picture of a circuit
1. A simple circuit: Loop equations and node equations Kirchhoff’s
laws.
An example with 4 identical bulbs
2. Definitions:
o
Conventional
current and current density
o
Conductivity and
resistivity
o
Ohm’s law
3. How does a capacitance depend on the gap-width?
4. RC circuit. The discharging case. What is I0?
5. RC circuit: The charging case.
Announcement:
Midterm 2: Class average
is 76.
o
How to determine
the letter grade you made for this midterm?
o
Find you scaled
score which is located near the bottom of the grading page.
o
Two letter grades
for each exam:
§ letter grade-1 based on % cutoffs.
§ Letter grade-2 based on scaled score cutoffs.
o
The letter grade you have made for this exam
is the higher of the two letter grades, if there is a difference.
o
I congratulate
those of you who have done well in this exam.
o
Those have done
below 60, you
need to look for ways to improve your performance.
o
I encourage you to
work all the problems you have missed without looking at the solutions.
o
Come to talk to
me during my office hours, or other time by appointment. Bring your work with you when you come.
o
Ch19.h1:
o
004 Choose all
correct answers
o
008 Assume the
time required to reach the steady state is with a speed of light.
o
018 Of the
following diagrams, which indicates qualitatively
correct surface charge distribution …
o
Homework due time
this week:
o
Ch19-h1 3/19(today) 11:30pm
o
Ch20-h1 3/21
11:30pm
o
Ch20-h2 3/23
11:30pm