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Announcements

Announcements. Homework for tomorrow… (Ch . 30, Probs. 29, 32, & 54) CQ6: I a = I d > I b = I c 30.14: 3.2 x 10 -3 A 30.17: a) 6.3 x 10 5 A/m 2 b) 6.6 x 10 -5 m/s Office hours… MW 12:30-1:30 pm TR 9-10 am F 10-11 am Tutorial Learning Center (TLC) hours:

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Announcements

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  1. Announcements • Homework for tomorrow… (Ch. 30, Probs. 29, 32, & 54) CQ6: Ia= Id > Ib= Ic 30.14: 3.2 x 10-3 A 30.17: a) 6.3 x 105 A/m2 b) 6.6 x 10-5 m/s • Office hours… MW 12:30-1:30 pm TR 9-10 am F 10-11 am • Tutorial Learning Center (TLC) hours: M 8-1 pm, 3-6 pm, W 8-1 pm, 2-6 pm TR 8-6 pm, F 8-2 pm

  2. Chapter 30 Current & Resistance (Resistance and Ohm’s Law)

  3. Review… • Resistivity & conductivity… • Ohm’s Law… where

  4. Resistance and Ohm’s Law Notice: Ohm’s Law is NOT a Law! The materials to which Ohm’s law applies are called Ohmic. • i.e.’s: metals and conductors

  5. Resistance and Ohm’s Law Nonohmicmaterials: • current, I, through the device is NOT directly proportional to the potential difference, ΔV. • i.e.’s: diodes, batteries, and capacitors

  6. Quiz Question 1 The current through a wire is measured as the potential difference V is varied. What is the wire’s resistance? • 0.01 . • 0.02 . • 50 . • 100 . • Some other value.

  7. Resistance and Ohm’s Law Q: How does the voltage drop across the wires compare to the voltage drop across the resistor?

  8. Resistance and Ohm’s Law Q: How does the voltage drop across the wires compare to the voltage drop across the resistor? A: ΔVwire << ΔVresist

  9. i.e. 30.8:A battery and a resistor What resistor would have a 15 mA current if connected across the terminals of a 9.0 V battery?

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