mayssa.osman@yahoo.com
Introduction | Task | Process | Resources| Evaluation | Conclusion |
Introduction
Understanding and applying Ohm's Law is one of the most fundamental skills to being successful in an Electro-Technology career.
Do you have an idea about Ohm's law?
Do you know what we mean the Ohm's law, Current, Voltage and Resistance ?
Do you want to know how to design electrical circuit?
Do you want to know how to calculate Current, Voltage and Resistance by using Ohm's law?
Do you want to know how to measure Current and Voltage?
You will be able to build, explore and test basic circuits using meters and by following the programmed activities you should very quickly develop an understanding of how circuits work and the use of Ohm’s law in calculations.
Let's get started...
Click on this link to open the physics lesson (Ohm's law) on my facebook
http://www.facebook.com/profile.php?id=1836025251&ref=profile
The Task
This Web Quest is divided into four parts:
Part 1
Series and Parallel Circuits: In this activity you will watch a movie on Ohm’s Law, visit three interactive web sites, and then use a computer simulation to help you understand how electric circuits work in both serial and parallel combinations. You will individually complete a worksheet designed to assess your understanding of each area.
Part 2
Using Ohm's law to calculate Current, Voltage and Resistance: In this section you will learn about using Ohm's low to calculate Current, Voltage and Resistance. The importance of Ohm's Law is that if you know the value two of the variables in the equation, you can then determine the third. You will link to an interactive web site where you will individually perform some calculations of Current, Voltage and Resistance.
Part 3
Measuring Current and Voltage: This section teaches you how to take accurate measurements of voltage, current and to identify typical instruments used in the field such as voltmeters and ammeters. You will individually answer a short online multiple choice (assignment).
Part 4
Ohm's Law Group Multimedia Presentation: Each group will create a short multimedia video (maximum 5 minutes duration) presentation in groups of four, which the leader of each group will present to class which demonstrates a principle or concept about Ohm’s Law. You will produce video by using Windows Movie Maker software
The Process
Activity I. SERIES AND PARALLEL CIRCUITS:
Electrical quantities: A flow of electrons forced into motion by voltage is known as current. The atoms in good conductors such as copper wire have one or more free electrons of the outer ring constantly flying off. Electrons from other nearby atoms fill in the holes. There are billions of electrons moving aimlessly in all directions, all the time in conductors. The amount of current in a circuit is measured in amperes (amps), the quantity of electrons used in determining an ampere is called "coulomb" which one ampere is one coulomb per second. This (a coulomb) is the unit of measuring electrical quantity or charge. In summary, the quantity of current present in our circuit is dependant upon the amount of voltage exerting electrical force and pressure on the electrons, and the amount of resistance in the circuit restricting and opposing the electron flow.
Ohm’s Law - Animation 1
Click on this image to learn more about circuit quantities using an animation. Whilst there, experiment with the voltage and resistance controls and note they are inversely proportional to each other.
Ohm’s Law - Animation 2
Click on this link below to reinforce Ohm's law concepts using another animation, this time utilizing multi-meters. Whilst there, follow the instructions on the site.
http://www.helpmyphysics.co.uk/OHMS_LAW_movie.swf
Ohm’s Law is a formulated relationship that links the electrical quantities of voltage, current and resistance in a meaningful way. To better understand Ohm’s Law, let us now watch a short video of approximately five minutes duration. Click here UEENEEE004B to open the video.
Series and Parallel circuits: The two most common ways of connecting resistors are in series and parallel. Resistors are considered to be in series whenever current must flow through them sequentially, first through one, then through the other. In contrast, Resistors are considered to be in parallel when each resistor is connected directly to the voltage source.
Computer animation exercise: Click this link below to download the worksheet
Series and Parallel Circuits Worksheet
Click here OHM ZONE to go to the OHM ZONE web site, and individually complete all questions and activities using the computerized simulation.
Information to help you: Click on the links below for additional information and exercises regarding ohm's law and series/parallel circuits.
http://library.thinkquest.org/10796/ch13/ch13.htm#s1
series, parallel circuit
http://www.walter-fendt.de/ph14e/combres.htm
Combinations of resistors
http://physics.uwstout.edu/physapplets/a-city/physengl/ohmslaw.htm
Ohm's Law
II.Using Ohm's law to calculate Current, Voltage and Resistance:
Ohm's Law is a mathematical equation governing the relationship between voltage, current, and resistance within a DC electrical circuit. In this activity you will discover the relationship between resistance, voltage, and current. If you know any two of the three values you can calculate the third. Your task is to discover the equations that allow you to do these calculations.
To practice some calculation of resistance, voltages, and current, click here
Test
Information to help you: Click on the link below for additional information and exercises regarding some calculations.
http://www.mathconnect.com/electric_calculation.htm
Power conversion online calculator.
Activity III. MEASURING CURRENT AND VOLTAGE:
To best understand the operation of these meters we will study the building block of these meters called a galvanometer. This is a moving coil meter which responds to changes in electrical current. Click here, to discover the fundamentals of a galvanometer.
Click here, to discover the fundamentals of a moving coil meter and how ammeters, voltmeters and ohmmeters work.
Click here Assignment, to link to a short multiple choice assignment examining your knowledge on ammeters and voltmeters and circuit measurement.
Information to help you: Click on the links below for additional information and exercises regarding ammeters and ohmmeters.
http://www.kpsec.freeuk.com/meters.htm
Good tutorial on all aspects of meter operation and measurement
Activity IV. OHM's LAW GROUP MULTIMEDIA PRESENTATION
Each group will create a short multimedia video presentation in groups of four, the leader of each group will present to class concept about Ohm’s Law.
Note: The leader of each group must send video in my email: Mayssa.osman@yahoo.com
Information to help you: To learn about any other functions of Movie Maker click on the Web links below.
http://presentationsoft.about.com/od/moviemaker/a/mov_mak_beg.htm
http://www.mightycoach.com/articles/mm2/
Notes:
Share your presentation with your classmates
Resources
The links contained within the process:
http://library.thinkquest.org/10796/ch13/ch13.htm#s1
series, parallel circuit
http://www.walter-fendt.de/ph14e/combres.htm
Combinations of resistors
http://physics.uwstout.edu/physapplets/a-city/physengl/ohmslaw.htm
Ohm's Law
http://www.article19.com/shockwave/oz.htm
OHM ZONE web site
http://www.google.com/#hl=en&q=UEENEEE004A+Solve+Problems+in+multiple+path+dc+circuits+Series+and+Parallel+Circuits+Worksheet+&btnG=Google+Search&aq=f&oq=&aqi=&fp=PMgqmDbxhjs
Series and Parallel Circuits Worksheet
http://www.mathconnect.com/electric_calculation.htm
Power conversion online calculator.
http://www.kpsec.freeuk.com/meters.htm
Good tutorial on all aspects of meter operation and measurement
http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/galvan.html#c1
http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/movcoil.html#c4
Link to Galvanometer Information
http://presentationsoft.about.com/od/moviemaker/a/mov_mak_beg.htm
http://www.mightycoach.com/articles/mm2/
Functions of Movie Maker
References related to Ohm's law:
http://en.wikipedia.org/wiki/Georg_Ohm
http://www.physics.uoguelph.ca/tutorials/ohm/Q.ohm.intro.html
http://en.wikipedia.org/wiki/Ohm%27s_law
http://www.the12volt.com/ohm/ohmslaw.asp
http://www.kpsec.freeuk.com/ohmslaw.htm
http://hyperphysics.phy-astr.gsu.edu/Hbase/electric/ohmlaw.html
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/resis.html
http://courses.science.fau.edu/~rjordan/rev_notes/25.2.htm
http://209.85.129.132/search?q=cache:X_3SPMV6APgJ:www.rtc.edu/CCE/Resources/Products/MathToolBox/files/5_LPElect%26OhmsLaw5.pdf+A+110+volt+wall+outlet+supplies+power+to+a+strobe+light+with+a+resistance+of+2200+ohms.+How+much+current+is+flowing+through+the+strobe+light%3F&cd=2&hl=en&ct=clnk
Websites of images and videos
http://members.iinet.net.au/~rhema/img/light_animation2.gif
http://en.wikipedia.org/wiki/Georg_Ohm
http://members.iinet.net.au/~rhema/img/electric%20circuit%20anim.gif
http://members.iinet.net.au/~rhema/img/Plug.gif
http://cnx.org/content/m10674/latest/
http://www.rtc.edu/CCE/Resources/Products/MathToolBox/files/5_LPElect&OhmsLaw5.pdf
http://images.google.co.uk/images?hl=en&q=Measuring+Current+and+Voltage&btnG=Search+Images&gbv=2&aq=f&oq
http://www1.istockphoto.com/file_thumbview_approve/857211/2/istockphoto_857211_presentation_icon.jpg
http://phet.colorado.edu/simulations/sims.php?sim=Ohms_Law
http://www.helpmyphysics.co.uk/OHMS_LAW_movie.swf
http://www.youtube.com/watch?v=vb0WZ6Q_80s&eurl=http%3A%2F%2Fmembers.iinet.net.au%2F%257Erhema%2FProcess.html&feature=player_embedded
http://members.iinet.net.au/~rhema/img/series%20parallel%20circuit.png
http://images.google.com/images?gbv=2&hl=en&q=Computer++exercise&sa=N&start=120&ndsp=20
http://members.iinet.net.au/~rhema/img/Ohm%20Zone.gif
http://images.google.com/images?hl=en&q=triangle+Ohms+law&btnG=Search+Images&gbv=2&aq=f&oq
http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/galvan.html#c1
http://members.iinet.net.au/~rhema/img/ammeter.jpg
http://members.iinet.net.au/~rhema/img/teamwork.gif
http://www.dkimages.com/discover/previews/944/90071843.JPG
Websites of my tools
http://www.facebook.com/profile.php?id=1836025251&ref=profile
http://www.quia.com/profiles/mosman30
http://www.youtube.com/user/mayssaosman
http://www.flickr.com/photos/39880387@N02/
http://123.writeboard.com/8360983d762fe75b2
Evaluation
Activity I
This self-paced individually completed exercise requires you to download a worksheet containing questions based on the Ohm Zone computerized circuit simulation. You must answer most questions correctly (min 80% score) to be considered competent.
Activity II
The multiple choice test required a minimum score of three out of four (min 75%) to be considered competent.
Activity III
The multiple choices quiz (assignment) simply completes and if you require any assistance ask your classroom teacher.
Activity IV
The content was presented with a high degree of flair and creativity, the group leader's authority was respected and the multimedia presentation was polished, succinct, interesting and kept the audience fully engaged.
Conclusion
You have no doubt learned a lot about some of the fundamentals of electrical quantities and circuits in this Web Quest; From Ohm's Law to analysis of series/parallel circuits, from power calculations to accurately measuring electrical quantities such as voltage and current. These skills and knowledge are fundamental to your success in your future career in the Electro-technology industry.
Congratulations...You've finished...
Well done!!!! And thank you for your participation in this Web Quest. Good luck with your future studies and remembers.....Learning is a journey for life!!!!!
Indicate on a matrix what tools you used for the web quest: Show how and why you used it.
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