o Course homepage, Ongoing Lectures, TT-system 

• Instructor’s weekly informal sessions:

Tu 3:30-4:20, RAS 213 ; Fri 4-5, RLM 5.104

Lecture: 14 Currents and Ohm’s law

A model for Ohm’s law

• Current density in terms of drift velocity
• Ohm’s law as a consequence of v_thermal >> v_drift

Temperature dependence of resistivity

• Ohmic matter
• Other cases:

o e.g. Jacob’s ladder

o Insulators, Semiconductors

o Superconductors

One more ohm’s law application: Text problem 65, PQ-page233

• An infinite ladder network

Reminder:

• There is instructor’s informal section today, see time and place above.

Reexam-set:

After each midterm there will be a reexam-set posted in your TT-account which is essentially identical to the midterm you have taken except that there will be a new version number.

• It is intended to give you a chance to work on the midterm once again in an open-book setting. Also, discussion among peers is allowed.
• The reexam-set is an optional homework. The advantage for doing it is that it gives you a chance to reflect how you should study in this course.
• Also at the end of the semester, re-exam grades may be used to replace your low homework grades.

Due dates:

• HW5 is due at 4am on Sunday.
• Midterm01 due at 4am on Monday