chap212 - PHYS 1302 Introductory Physics II Chapter...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
1 PHYS 1302 Introductory Physics II Chapter 21:Electric current & DC circuits
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
7/13/09 LAU/PHYS 1302 chap21 12-2 Topics s Concept of electric current s Ohm’s Law s Electric power and energy s DC circuits s Kirchhoff’s Laws s Capacitors s RC circuit
Background image of page 2
7/13/09 LAU/PHYS 1302 chap21 12-3 Electric current I = Δ Q Δ t Mechanical Analog Work done by battery W = Δ Q ε : electromotive force, emf SI unit: coulomb / second = Ampere (A) 1 A = 1 C / s
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
7/13/09 LAU/PHYS 1302 chap21 12-4 Example of source of constant potential difference A Voltaic cell (a chemical battery) is a source of constant potential difference by using chemical energy to separate positive and negative charges. PbO 2 (anode) Pb (cathode) H 2 SO 4 + H 2 O Discharing: Anode: PbO 2 + H 2 SO 4 + 2e + 2H + PbSO 4 + 2H 2 O Cathode: Pb + SO 4 -- PbSO 4 + 2e
Background image of page 4
7/13/09 LAU/PHYS 1302 chap21 12-5 Electric resistance & Ohm’s Law V I Ohm's Law V = IR R = V I R is the electrical resistance. SI unit for R: Ohm = Volt / Ampere 1 ohm ( Ω ) = 1V 1A
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
7/13/09 LAU/PHYS 1302 chap21 12-6 Example 21-2 A Current-Carrying Wire
Background image of page 6
7/13/09 LAU/PHYS 1302 chap21 12-7 Resistivity R = ρ L A L: length of wire A: area of wire copper = 1.72 × 10 - 8 Ω⋅ m : resistivity SI unit: Ω⋅ m
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
7/13/09 LAU/PHYS 1302 chap21 12-8 Table 21-1Resistivities
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/10/2010 for the course PHYS 1102 taught by Professor Lau during the Spring '10 term at Houston Baptist.

Page1 / 24

chap212 - PHYS 1302 Introductory Physics II Chapter...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online