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Instructor’s informal sessions:

• Tu 3:30-4:20pm, RAS 213.
• Fri 4-4:50pm, ECJ 1.204.

Lecture: 14 Currents and Ohm’s law (iq10)

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

Reminder:

• For the letter grade you have made for this midterm see the firstday handout, item6, the second paragraph.
• There is instructor’s informal section today, see time and place above.
• HW due dates:

§ HW5 is due at 4am on Tuesday, 2/24.

§ The due time of hw6 will resume the regular schedule, see syllabus.