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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
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


Chapter 30

Chapter 30

Current & Resistance

(Resistance and Ohm’s Law)


Review
Review…

  • Resistivity & conductivity…

  • Ohm’s Law…

    where


Resistance and ohm s law
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


Resistance and ohm s law1
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


Quiz question 1
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.


Resistance and ohm s law2
Resistance and Ohm’s Law

Q: How does the voltage drop across the wires compare to the voltage drop across the resistor?


Resistance and ohm s law3
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


I e 30 8 a battery and a resistor
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?