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Instructor’s informal sessions:

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

Lecture: 13 Currents and Ohm’s law (iq09)

A simple electric circuit

• V and I (current)
• E=V/l and J=I/A (current density)

Ohm’s law

• Relationship between V and I
• Relationship between E and J

Resistor network

• Series and || connections
• Capacitor connections vs resistor connections

A model for Ohm’s law

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

Reminders:

• Midterm 1: Th(2/19), 7:00-8:30 (Be there by 6:50). Ch22-26,27*. FAC 21

*You are only responsible for the qualitative knowledge of ch27 material covered in today’s class.

• Links from the course homepage:

§ Advice for taking an exam

§ Advice for exam preparation

o Policies:

§ Calculator which has the capability of storing formula (e.g. graphic calculator) is allowed only after its memory is cleared. ( At the beginning of the exam, if you use a graphic calculator, please show your “memory clearance” to one neighbor).

§ For current semester, we use no-negative scoring grading policy.

§ See advice links for more information.