Feb9 - PHYS142 Lecture 15 Direct Current Circuits Chapter...

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

View Full Document Right Arrow Icon
Direct Current Circuits • Chapter 28 All sections except 5 28.1 Electromotive Force 28.2 Resistors in Series and Parallel 28.3 Kirchhoff’s Rules 28.4 RC Circuits PHYS142 Lecture 15 1
Background image of page 1

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

View Full DocumentRight Arrow Icon
Kirchhoff’s Rules (28.3) 1. Junction/Node Rule “The sum of the currents entering a junction equals the sum of the currents leaving that junction” junction I 1 I 2 I I = I 1 + I 2 Conservation of charge 2
Background image of page 2
2. Loop Rule “The algebraic sum of the changes in potential around any loop must be zero.” * The potential increases for a path from the -ve terminal to the +ve terminal of a battery. * The current flows from a higher potential to a lower potential. Conservation of energy 3
Background image of page 3

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

View Full DocumentRight Arrow Icon
I I I + _ A B C Loop: A B C A V A B + V B C + V C A = 0 + V I R 2 I R 1 = 0 V R 2 R 1 Example 3: 4 2 1 R R V I
Background image of page 4
+ V _ + V R R path path path path Decrease in potential, V Increase in potential, +V Decrease in potential, IR Increase in potential, +IR I I 5 _
Background image of page 5

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

View Full DocumentRight Arrow Icon
Example 3 Find the current in each resistor in the figure below. 5 1 R 60 2 R 30 3 R 100 4 R 40 5 R V 12 6
Background image of page 6
R and R 1 are connected in series; 1 R R R 25 5 1 R 20 R 100 4 R 40 5 R V 12 7 Example 3
Background image of page 7

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

View Full DocumentRight Arrow Icon
R 2 and R 3 are connected in parallel; 3 2 1 1 1 R R R 20 R 5 1 R 60 2 R 30 3 R 100 4 R 40 5 R V 12 8 Example 3
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 02/22/2011 for the course PHYS 142 taught by Professor Altounian during the Spring '07 term at McGill.

Page1 / 28

Feb9 - PHYS142 Lecture 15 Direct Current Circuits 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