Stuff

HW 8 is coming. It will take you about 30min. Seriously.

If you had grade changes on Friday that we talked about, they are in the spreadsheet, but not uploaded to eLearning yet. Should have them uploaded this evening.

Grades

eLearning is updated with all outstanding work, except HW7.

The "Cur. Avg." column now takes into account your dropped grades: 2 dropped labs, 1 dropped quiz*, and 1 dropped homework. This is now a realistic representation of your grade.

The final exam counts as 25% of your grade if you want to estimate what you need on the final to get a certain grade.

*Quiz 4 is dropped for everyone, unless it is higher than your lowest non-dropped grade (at which point it replaces the lowest non-dropped grade).

Exam II

You'll get them back tomorrow. Most of you will be very pleasantly surprised. Elearning grades will be updated tomorrow sometime I hope; there are still HW and quizzes that need to be graded as well.

FYI, hand grading really sucks, but is worth the effort.

HW8

... will be due on Monday, not tomorrow. Details later.

[cough]

Check out problem 2 in section 2 and problem 2 in section 3. You will be rewarded if you do so.

Lab today

Labs today: 3 mini procedures

Reflection & refraction
Total internal reflection
Lenses

HW 7 solutions

Here.

Filter circuits

This site is generally a good electronics resource, and it has a nice set of pages on filters.

Quiz solutions

All quiz solutions are now available (along with the original quizzes). Right over here.

All homework solutions are also available, except for HW 7 that was due about 4 minutes ago. I should have that one posted around class time tomorrow, or at least a partial solution if nothing else.

HW7 Answers

#1: thickness ~3e-9 m; time constant about 1e-3 sec; resistivity ~ 4e7
#2: about 2.25mV
#3: 43.75A, 38W
#4: steady currents can't go through the capacitor, ac currents can ...

Quiz and homework solutions are being updated right now ... should be complete shortly. Will post again here when they are done.

Grades

Your latest grades are on eLearning; this includes everything except today's lab. The "Curr. Avg. (no drops)" column is a weighted average of all of your different grades, not including the drop grades you are allowed. As usual, consider it a worst-case scenario.

Please check carefully that everything that is supposed to appear actually does - occasionally, lab reports or homework sets are misplaced, and the sooner we know the better.

Some details regarding Thursday's impending exam will show up here later tonight ...

Also: if you have questions about any of your grades, or can't/wont use eLearning, you can ask me tomorrow and I'll give you a grade breakdown.

Today's quiz

That circuit from the quiz today is often called a diode snubber, or a flyback diode. Very handy protection circuits; one can do similar things with an RC circuit (or low-pass filter) to buffer out rapid changes in current/voltage in a circuit.

Anyway: I didn't just make it up.

Homework 7

A short HW7, due by the end of Tuesday 28 July 09.

Mon 27 Jul 09

Tomorrow, a lab on ac circuits. There are things in the lab write-up we did not directly cover in lecture, so be sure to read the introduction ...

Lecture: we'll start EM waves and move in to reflection & refraction. There will be a short quiz on ac circuits, covering the material from this past Friday's lecture.

There will be a very short homework set due Tuesday evening, only 2-3 problems, which will appear Monday morning.