Lecture Outline Chapter 18 College Physics, 7 th Edition Wilson / Buffa / Lou © 2010 Pearson Education, Inc.

Slides:



Advertisements
Similar presentations
Circuits Electromotive Force Work, Energy and emf
Advertisements

Unit 8 Combination Circuits
Happyphysics.com Physics Lecture Resources Prof. Mineesh Gulati Head-Physics Wing Happy Model Hr. Sec. School, Udhampur, J&K Website: happyphysics.com.
Lecture 7 Circuits Ch. 27 Cartoon -Kirchhoff's Laws Topics –Direct Current Circuits –Kirchhoff's Two Rules –Analysis of Circuits Examples –Ammeter and.
AP Physics Chapter 18 Basic Electric Circuits
Chapter 32 Fundamentals of Circuits
Chapter 19 DC Circuits.
Direct Current Circuits
DC circuits Physics Department, New York City College of Technology.
Dr. Jie ZouPHY Chapter 28 Direct Current Circuits (Cont.)
Copyright © 2009 Pearson Education, Inc. Lecture 7 – DC Circuits.
© 2015 Pearson Education, Inc.
بسم الله الرحمن الرحيم FCI.
© 2007 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching their.
© 2014 Pearson Education, Inc. This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching their.
© 2005 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching their.
© 2005 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching their.
Lecture 2 Basic Circuit Laws
Copyright © 2009 Pearson Education, Inc. Chapter 26 DC Circuits.
Week 04, Day 2 W10D2 DC Circuits Today’s Reading Assignment W10D2 DC Circuits & Kirchhoff’s Loop Rules Course Notes: Sections Class 09 1.
Chapter 6 Parallel Circuits.
Chapter 27 Lecture 12: Circuits.
Series and Parallel Circuits
Copyright © 2012 Pearson Education Inc. PowerPoint ® Lectures for University Physics, Thirteenth Edition – Hugh D. Young and Roger A. Freedman Lectures.
Lecture Outline Chapter 21 Physics, 4th Edition James S. Walker
Series Circuits Circuits in which there is only one path for current to flow through All elements of the circuit (resistors, switches etc…) are in the.
Series, Parallel, and Series- Parallel Circuits
In conclusion, there are two requirements which must be met in order to establish an electric circuit. The requirements are: 1.There must.
Basic Electrical Engineering Lecture # 04 Simple Resistive Circuits Course Instructor: Engr. Sana Ziafat.
FCI. Direct Current Circuits: 3-1 EMF 3-2 Resistance in series and parallel. 3-3 Rc circuit 3-4 Electrical instruments FCI.
Chapter 18 Direct Current Circuits. Sources of emf The source that maintains the current in a closed circuit is called a source of emf The source that.
Unit 8: Part 2 Electric Circuits
Circuits Chapter 23.
Chapter 26 DC Circuits. Units of Chapter EMF and Terminal Voltage - 1, Resistors in Series and in Parallel - 3, 4, 5, 6, Kirchhoff’s.
Welcome to Physics Jeopardy Chapter 18 Final Jeopardy Question Equivalent Resistance 100 Complex circuits Misc Parallel.
Copyright © 2009 Pearson Education, Inc. Chapter 26 DC Circuits.
Chapter 20 Basic Electric Circuits
Series and Parallel Circuits Making Electricity Work for Us.
Chapter 25 Electric Circuits.
Basic Electric Circuits Chapter 18. Circuit Components.
10/9/20151 General Physics (PHY 2140) Lecture 10  Electrodynamics Direct current circuits parallel and series connections Kirchhoff’s rules Chapter 18.
Chapter 19 DC Circuits. Objective of the Lecture Explain Kirchhoff’s Current and Voltage Laws. Demonstrate how these laws can be used to find currents.
Chapter 28 Direct Current Circuits. Direct Current When the current in a circuit has a constant direction, the current is called direct current Most of.
Chapter 28 Direct Current Circuits. Introduction In this chapter we will look at simple circuits powered by devices that create a constant potential difference.
Series wiring means that the devices are connected in such a way that there is the same electric current through each device. One loop only for the flow.
Lecture 11-1 Electric Current Current = charges in motion Magnitude rate at which net positive charges move across a cross sectional surface Units: [I]
Chapter 28 Direct Current Circuits CHAPTER OUTLINE 28.1 Electromotive Force 28.2 Resistors in Series and Parallel 28.3 Kirchhoff’s Rules.
Series and Parallel Circuits
1 Electronics Parallel Resistive Circuits Part 1 Copyright © Texas Education Agency, All rights reserved.
Chapter 27 Lecture 23: Circuits: I. Direct Current When the current in a circuit has a constant direction, the current is called direct current Most of.
Series and Parallel Circuits Direct Current Circuits.
Copyright © 2012 Pearson Education Inc. PowerPoint ® Lectures for University Physics, Thirteenth Edition – Hugh D. Young and Roger A. Freedman Lectures.
Power Input to a Source Current flows “backwards” Work is being done on, rather than by the top battery (source of non-electrostatic force) Rate of conversion.
Lectures 7 to 10 The Electric Current and the resistance Electric current and Ohm’s law The Electromotive Force and Internal Resistance Electrical energy.
Copyright © 2009 Pearson Education, Inc. An ammeter measures current; a voltmeter measures voltage. Both are based on galvanometers, unless they are digital.
Chapter 19 DC Circuits. EMF and Terminal Voltage Any device that can transform a type of energy into electric energy is called a source of electromotive.
RC Circuits Physics 102 Professor Lee Carkner Lecture 16.
Current = charges in motion
Direct-Current Circuits
RESISTORS IN SERIES - In a series circuit, the current is the same
Ammeters and Voltmeters*
ConcepTest 4.1a Series Resistors I
This Class Resistors in series: Current through is same.
Bell Ringer: Define to the best of your ability the definition of:
Ideal vs Real Battery Ideal battery: no internal energy dissipation
Ohm’s Law This formula shows the relationship between current, voltage and resistance. Voltage (Volts) Current (Amps) Resistance (Ohms, )
Direct-Current Circuits
Physics 4 – Feb 8, 2018 P3 Challenge –
Automotive Technology Principles, Diagnosis, and Service
Presentation transcript:

Lecture Outline Chapter 18 College Physics, 7 th Edition Wilson / Buffa / Lou © 2010 Pearson Education, Inc.

18.1 Resistances in Series, Parallel, and Series–Parallel Combinations A few things about resistance before we start!!!! The resistance symbol is ….. –We can use the resistance symbol to represent ANY type of circuit element. Assume constant resistance unless otherwise stated.

18.1 Resistances in Series, Parallel, and Series–Parallel Combinations Resistors in series all have the same current. Individual voltages across the resistors add up to equal the voltage across the battery terminals. © 2010 Pearson Education, Inc.

18.1 Resistances in Series, Parallel, and Series–Parallel Combinations Series means head to tail (so a + is connected to a -) Why must current stay the same in each through each resistor?

18.1 Resistances in Series, Parallel, and Series–Parallel Combinations Let’s simplify the first picture:

18.1 Resistances in Series, Parallel, and Series–Parallel Combinations The resistance value of a single resistor that could replace all resistors, but maintain the same current is called: Equivalent Series Resistance This formula is valid for any number of resistors in series. Let’s do a simple example…. © 2010 Pearson Education, Inc.

18.1 Resistances in Series, Parallel, and Series–Parallel Combinations 2 major disadvantages of Series Connections: –If one bulb burns out… –Each bulb operates at less than the battery voltage…

18.1 Resistances in Series, Parallel, and Series–Parallel Combinations Resistors in parallel have common connections (+ and +) Resistors in parallel all have the same voltage. © 2010 Pearson Education, Inc. Parallel circuits divide into different paths. Current wants to take path of least resistance.

18.1 Resistances in Series, Parallel, and Series–Parallel Combinations Let’s simplify the first parallel picture:

18.1 Resistances in Series, Parallel, and Series–Parallel Combinations The equivalent parallel resistance is the value of a single resistor that could replace all the resistors in the parallel configuration and maintain the same current. The equivalent resistance in a parallel configuration is always less than the smallest resistance….for example… © 2010 Pearson Education, Inc.

18.1 Resistances in Series, Parallel, and Series–Parallel Combinations What is the equivalent resistance of 3 resistors (1.0 ohm, 2.0 ohm, and 3.0 ohm) when connected (a) in series and (b) in parallel. (c) How much total current will be delivered by a 12 V battery in each of these arrangements? (d) How much current will be in each resistor and what is the voltage drop across each resistor in each arrangement?

18.1 Resistances in Series, Parallel, and Series–Parallel Combinations Christmas Tree Lights: –How they use to work –How they work now…

18.1 Resistances in Series, Parallel, and Series–Parallel Combinations Consider a string of Christmas tree lights composed of bulbs with jumper shunts, as in the picture on the last slide. If the filament of one bulb burns out and the shunt completes the circuit, will the other bulbs each (a) glow a little more brightly (b) glow a little more dimly (c) be unaffected

18.1 Resistances in Series, Parallel, and Series–Parallel Combinations Here is a procedure to analyze Series-Parallel Resistor Combinations –Determine which groups of resistors are in series and which are in parallel and then reduce. (You may have to reduce multiple times) –Find the current delivered to the reduced circuit using I = V/R total –Expand the reduced circuit back to the actual circuit to find currents and voltages for the resistors in each step.

18.1 Resistances in Series, Parallel, and Series–Parallel Combinations For combination circuits, simplify piece by piece. © 2010 Pearson Education, Inc.

18.1 Resistances in Series, Parallel, and Series–Parallel Combinations

What are the voltages across and currents in each of the resistors R 1 through R 5 in the figure to the right? This is a REALLY great FRQ!

18.2 Multiloop Circuits and Kirchhoff’s Rules Some circuits can’t always be reduced by pure series and parallel methods. A dude named Kirchhoff made some rules… © 2010 Pearson Education, Inc.

18.2 Multiloop Circuits and Kirchhoff’s Rules Kirchhoff’s first rule is the junction rule: *First a junction (or node) is a point where 3 or more wires are joined. *A path connecting 2 junctions is called a branch. The sum of all currents at any junction is 0. This means that the current coming into the junction must be equal to the current leaving the junction. © 2010 Pearson Education, Inc.

18.2 Multiloop Circuits and Kirchhoff’s Rules Kirchhoff’s second rule is the loop rule: The sum of the potential differences around a closed loop is zero. Sign conventions for traversing batteries and resistors are at left. © 2010 Pearson Education, Inc.

18.2 Multiloop Circuits and Kirchhoff’s Rules Two resistors R 1 and R 2 are connected in parallel. This combination is in series with a third resistor, R 3, which has the largest resistance of the three. (a) Which resistor will carry the most current: R 1, R 2, or R 3 ? Explain.

Skipping Pages we are skipping! You will not be tested on RC circuits. Also, from pages is discussing galvanometers, but these work also on magnetic properties so we will discuss in Chapter 19. Finally, Household circuits and electrical safety will not be tested as well so we can skip Section 18.5.

18.4 Ammeters and Voltmeters The deflection of a galvanometer is proportional to the current. © 2010 Pearson Education, Inc.

18.4 Ammeters and Voltmeters An ammeter measures current. In order to do this, it must be connected in series; so as not to change the existing current significantly, its resistance should be as small as possible. © 2010 Pearson Education, Inc.

18.4 Ammeters and Voltmeters A voltmeter measures voltage. In order to do this, it must be connected in parallel across the voltage to be measured; so as not to change the existing voltage significantly, its resistance should be as large as possible. © 2010 Pearson Education, Inc.

18.4 Ammeters and Voltmeters Multirange meters have a selection of shunt and multiplier resistors, to optimize the measurement of currents and voltages of different magnitudes. © 2010 Pearson Education, Inc.