- published: 10 Dec 2012
- views: 58313
The electrical resistance of an electrical conductor is a measure of the difficulty to pass an electric current through that conductor. The inverse quantity is electrical conductance, the ease with which an electric current passes. Electrical resistance shares some conceptual parallels with the notion of mechanical friction. The SI unit of electrical resistance is the ohm (Ω), while electrical conductance is measured in siemens (S).
An object of uniform cross section has a resistance proportional to its resistivity and length and inversely proportional to its cross-sectional area. All materials show some resistance, except for superconductors, which have a resistance of zero.
The resistance (R) of an object is defined as the ratio of voltage across it (V) to current through it (I), while the conductance (G) is the inverse:
For a wide variety of materials and conditions, V and I are directly proportional to each other, and therefore R and G are constant (although they can depend on other factors like temperature or strain). This proportionality is called Ohm's law, and materials that satisfy it are called ohmic materials.
Resistance may refer to:
Khan Academy is a non-profit educational organization created in 2006 by educator Salman Khan with the aim of providing a free, world-class education for anyone, anywhere. The organization produces short lectures in the form of YouTube videos. In addition to micro lectures, the organization's website features practice exercises and tools for educators. All resources are available for free to anyone around the world. The main language of the website is English, but the content is also available in other languages.
The founder of the organization, Salman Khan, was born in New Orleans, Louisiana, United States to immigrant parents from Bangladesh and India. After earning three degrees from the Massachusetts Institute of Technology (a BS in mathematics, a BS in electrical engineering and computer science, and an MEng in electrical engineering and computer science), he pursued an MBA from Harvard Business School.
In late 2004, Khan began tutoring his cousin Nadia who needed help with math using Yahoo!'s Doodle notepad.When other relatives and friends sought similar help, he decided that it would be more practical to distribute the tutorials on YouTube. The videos' popularity and the testimonials of appreciative students prompted Khan to quit his job in finance as a hedge fund analyst at Connective Capital Management in 2009, and focus on the tutorials (then released under the moniker "Khan Academy") full-time.
Current may refer to:
Crash Course (also known as Driving Academy) is a 1988 made for television teen film directed by Oz Scott.
Crash Course centers on a group of high schoolers in a driver’s education class; many for the second or third time. The recently divorced teacher, super-passive Larry Pearl, is on thin ice with the football fanatic principal, Principal Paulson, who is being pressured by the district superintendent to raise driver’s education completion rates or lose his coveted football program. With this in mind, Principal Paulson and his assistant, with a secret desire for his job, Abner Frasier, hire an outside driver’s education instructor with a very tough reputation, Edna Savage, aka E.W. Savage, who quickly takes control of the class.
The plot focuses mostly on the students and their interactions with their teachers and each other. In the beginning, Rico is the loner with just a few friends, Chadley is the bookish nerd with few friends who longs to be cool and also longs to be a part of Vanessa’s life who is the young, friendly and attractive girl who had to fake her mother’s signature on her driver’s education permission slip. Kichi is the hip-hop Asian kid who often raps what he has to say and constantly flirts with Maria, the rich foreign girl who thinks that the right-of-way on the roadways always goes to (insert awesomely fake foreign Latino accent) “my father’s limo”. Finally you have stereotypical football meathead J.J., who needs to pass his English exam to keep his eligibility and constantly asks out and gets rejected by Alice, the tomboy whose father owns “Santini & Son” Concrete Company. Alice is portrayed as being the “son” her father wanted.
A simple description of electric resistance, how the electricity is affected and how the resistance determines the heat output of electric heating elements
This interactive animation describes about the electrical resistance, factors affecting resistance of wire. It also describes about the length of the wire, thickness of the wire, material of the wire and the temperature of the wire. This is a product of Mexus Education Pvt. Ltd., an education innovations company based in Mumbai, India. http://www.mexuseducation.com, http://www.ikenstore.in For more videos visit https://www.youtube.com/ikenedu Follow us on twitter https://twitter.com/ikenedu Like us on https://www.facebook.com/ikenconnect
Here, I'll introduce how resistance is an electrical friction, in that it takes useful energy and converts it to heat. Resistivity is related to conductance and conductivity, too. See how judgmental I can be?
So, electric current works like a river... kinda... Instead of flowing based on elevation, electric current works a little differently. But it's a good metaphor. In this episode of Crash Course Physics, Shini talks to us about electric current, voltaic cells, and how we get electric charge. Get your own Crash Course Physics mug from DFTBA: http://store.dftba.com/products/crash... The Latest from PBS Digital Studios: https://www.youtube.com/playlist?list... -- Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios -- Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashC... Twitter - http://www.twitter.com/TheCrashCourse Tumblr - http://thecrashcourse.tumblr.com Support CrashCourse on Patreon: http://ww...
Useful for CBSE, ICSE, NCERT & International Students Grade : 10 Subject :Physics Lesson :Electricity, Heating and chemical effect of current Topic: Electrical Resistance Resistance is an electrical quantity that measures how the device or material reduces the electric current flow through it. Theresistance is measured in units of ohms (Ω). If we make an analogy to water flow in pipes, the resistance is bigger when the pipe is thinner, so the water flow is decreased. Visit www.oztern.com to find personalized test preparation solutions for Pre Medical - AIPMT, AIIMS, JIPMER, State, Pre Engineering - IIT JEE, JEE MAIN, BITSAT, State and Foundations - Class 6 to 10.
In this video we start looking at resistance, which we're going to explore in later videos. We look at what causes resistance and how to calculate it. Don't panic if maths is not your subject, I've included a triangle to help you.
This video about of resistance (प्रतिरोध) You can clearly understand in this video Whats the basic of resistance in hindi language
Let's look at the properties of materials that cause a resistor to resist the flow of current. Created by David SantoPietro. Watch the next lesson: https://www.khanacademy.org/science/physics/circuits-topic/circuits-resistance/v/voltmeters-and-ammeters?utm_source=YT&utm_medium=Desc&utm_campaign=physics Missed the previous lesson? https://www.khanacademy.org/science/physics/circuits-topic/circuits-resistance/v/analyzing-a-resistor-circuit-with-two-batteries?utm_source=YT&utm_medium=Desc&utm_campaign=physics Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out o...
Whenever you plug something into an electrical socket, don't you wonder what's going on? Well you should, as it's pretty neat. What is electricity made of? How did we figure out how to harness this power? Let's take a look! Subscribe: http://bit.ly/ProfDaveSubscribe ProfessorDaveExplains@gmail.com http://patreon.com/ProfessorDaveExplains http://professordaveexplains.com http://facebook.com/ProfessorDaveExpl... http://twitter.com/DaveExplains Classical Physics Tutorials: http://bit.ly/ProfDavePhysics1 Modern Physics Tutorials: http://bit.ly/ProfDavePhysics2 Mathematics Tutorials: http://bit.ly/ProfDaveMaths General Chemistry Tutorials: http://bit.ly/ProfDaveGenChem Organic Chemistry Tutorials: http://bit.ly/ProfDaveOrgChem Biochemistry Tutorials: http://bit.ly/ProfDaveBiochem Biology Tuto...
http://www.mediafire.com/file/84j7emp29chcl9r/Zag+prep+Electric+current+.pdf
Trying to explain resistance!
This physics video tutorial explains the concept of series and parallel circuits and how to find the electrical current that flows through the circuit. It discusses Ohm's law and the relationship between voltage, current, and resistance. This tutorial review contains plenty of notes, equations / formulas, examples, and practice problems to help you on your next worksheet assignment, quiz / test or even upcoming final exam. Here is a list of topics: 1. Ohm's Law - Voltage, Current, Resistance - V=IR Formula 2. Voltage and Current are directly proportional 3. Resistance and Current are inversely proportional 4. Definition of Voltage - Electric Potential Energy Per Unit Charge 5. Voltage Formula - Work Divided By Charge in Coulombs 6. Unit of Voltage - Volt & Unit of Current - Amps o...
During ERW, a high frequency electrical current is transmitted to the material by means of copper sliding contacts so that the abutting edges initiate fusion as they come into contact. Tenaris has welded pipe mills in Argentina, Brazil, Canada, Colombia and the United States.
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain the basic laws of resistance and resistivity of current, ohms, and the relationship of current and resistance. Next video in this series can be seen at: https://youtu.be/NqnyYNxl89g
This physics video tutorial explains the concept of basic electricity and electric current. It explains how DC circuits work and how to calculate voltage, current, and electrical resistance using Ohm's law. In addition, it shows you how to calculate the electric charge and the number of electrons flowing through a wire at any given point. In addition, it has a few examples and practice problems on electric power, cost of electricity in Kwh and other stuff as well. It provides visual drawings, equations, and formulas as well as the units of common variables that you'll encounter when dealing with electricity. It discusses the difference between conventional current and electron flow. The unit of electric current is the ampere or amps for short. The unit for resistance is ohms and for...
The electrical resistance of a coil of wire changes as it is cooled in liquid nitrogen.
Volts, Amps, Ohms, Watts and how they are related. Contact info, sending stuff in etc.: http://xo4.uk/?YTT Website: http://xo4.uk/?oHm Support this channel at Patreon: https://www.patreon.com/jwflame Twitter: https://twitter.com/jwflame Facebook: https://www.facebook.com/jwflame Instagram: https://www.instagram.com/jwflame/
How do you analyze a circuit with resistors in series and parallel configurations? With the Break It Down-Build It Up Method! http://www.jesseleemason.com Music by Millish - Download our music (that's me on the acoustic guitar) at the iTunes Store: https://itunes.apple.com/us/album/millish/id128839547 0:00 INTRO: In this video we solve a combination series and parallel resistive circuit problem for the voltage across, current through and power dissipated by the circuit's resistors. 1:32 BREAK IT DOWN: We redraw the circuit in linear form to more easily identify series and parallel relationships. Then we combine resistors using equivalent resistance equations. After redrawing several times we end up with a single resistor representing the equivalent resistance of the circuit. We then ...
X CBSE PHYSICS LECTURES IN HINDI. CLASS 10 PHYSICS. WHAT IS RESISTANCE . DIFFERENCE BETWEEN RESISTANCE AND RESISTIVITY. .. ELECTRICITY - OHM'S LAW -~-~~-~~~-~~-~- Please watch: "IUPAC Naming Organic Chemistry for XI | XII | JEE-Main | JEE-Advanced | NEET" https://www.youtube.com/watch?v=h56Z3TZVNgM -~-~~-~~~-~~-~-
This one exposes the myth that more resistance to current flow creates more heat in the electric heating element. This video is part of the heating and cooling series of training videos made to accompany my websites: www.graycoolingman.com and www.grayfurnaceman.com to pass on what I have learned in many years of service and repair. If you have suggestions or comments they are welcome. If you are a homeowner looking to repair your own appliance, understand that the voltages can be lethal, the fuels are highly flammable and high pressures are used. Know your limits.
This physics video tutorial explains the concept of series and parallel circuits and how to find the electrical current that flows through the circuit. It discusses Ohm's law and the relationship between voltage, current, and resistance. This tutorial review contains plenty of notes, equations / formulas, examples, and practice problems to help you on your next worksheet assignment, quiz / test or even upcoming final exam. Here is a list of topics: 1. Ohm's Law - Voltage, Current, Resistance - V=IR Formula 2. Voltage and Current are directly proportional 3. Resistance and Current are inversely proportional 4. Definition of Voltage - Electric Potential Energy Per Unit Charge 5. Voltage Formula - Work Divided By Charge in Coulombs 6. Unit of Voltage - Volt & Unit of Current - Amps o...
Volts, Amps, Ohms, Watts and how they are related. Contact info, sending stuff in etc.: http://xo4.uk/?YTT Website: http://xo4.uk/?oHm Support this channel at Patreon: https://www.patreon.com/jwflame Twitter: https://twitter.com/jwflame Facebook: https://www.facebook.com/jwflame Instagram: https://www.instagram.com/jwflame/
http://www.mediafire.com/file/84j7emp29chcl9r/Zag+prep+Electric+current+.pdf
This is just a few minutes of a complete course. Get full lessons & more subjects at: http://www.MathTutorDVD.com. In this lesson the student will learn what voltage, current, and resistance is in a typical circuit.
3 calculation examples step-by-step
Ohms Law Graph of V vs I Resistance = slope of V vs I Graph Ohmic Conductors Resisitivity Factors on Which Resistance Depends Effect of Temperature Change on Resistance Change in Resistance on Streching Change in Resistance on Folding
For more information about Professor Shankar's book based on the lectures from this course, Fundamentals of Physics: Mechanics, Relativity, and Thermodynamics, visit http://bit.ly/1jFIqNu. Fundamentals of Physics, II (PHYS 201) Lecture begins with a discussion of electric potential distribution in conductors. Image charges are introduced and exploited. Capacitance is explained in greater detail and illustrated using the parallel plate capacitor. The energy stored in the electric field is derived. The forces acting on an electric current flowing through a conducting wire are examined. The RC circuits and its energetics are discussed. The EMF due to a battery is explained. 00:00 - Chapter 1. Review of Image Charges 28:45 - Chapter 2. The Parellel Plate Capacitor 42:46 - Chapter 3. The Con...
This video is about concept of resistance . Factors affecting resistance . Resistance equation has also been explained . If you like these videos then subscribe to my channel- http://youtube.com/ccukt Get Free Essay at EssSSay.com, My FACEBOOK essay page facebook.com/FreeEssay
In this video I discuss electrical resistance, most specifically DC resistance. At 19:53 I make a mistake- that 15Ω should be 25Ω. I need to stop doing these videos when I'm so tired, but I only ever feel like it late at night.
Currents - Resistivity - Ohm's Law This lecture is part of 8.02 Physics II: Electricity and Magnetism, as taught in Spring 2002 by Dr. Walter Lewin at MIT. This video was formerly hosted on the YouTube channel MIT OpenCourseWare. This version was downloaded from the Internet Archive, at https://archive.org/details/MIT8.02S02/. Attribution: MIT OpenCourseWare License: Creative Commons BY-NC-SA 3.0 US To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/us/. More information at http://ocw.mit.edu/terms/. This YouTube channel is independently operated. It is not affiliated with MIT, MIT OpenCourseWare, the Internet Archive, or Dr. Lewin, nor do they endorse any content on this channel.
Auto transformer, How to study electrical, Electrical engineering, Volt, Resistor, Ohm, Electric circuits, How do you analyze a circuit with resistors in series and parallel configurations? With the Break It Down-Build It Up MethodIn This video we solve a combination series and parallel resistive circuit problem for the voltage across, current through and power dissipated by the circuit's resistors.We redraw the circuit in linear form to more easily identify series and parallel relationships. Then we combine resistors using equivalent resistance equations. After redrawing several times we end up with a single resistor representing the equivalent resistance of the circuit. We then apply Ohm's Law to this simple (or rather simplified) circuit and determine the circuit current (I-0 in the ...
This project has been created with Explain Everything™ Interactive Whiteboard for iPad
Looking at the basic principles of electricity: current, voltage, resistance, power, KIrchhoff's rules
(C) Stephen Easley Walsh. All rights resevered. https://www.MathsGrinds.ie/
ZOGPhysics 435 - Electrical Circuits Revision - Current, Voltage and Resistance
اسم المساق: فيزياء عامة (ب) اسم المحاضر: أ.د. بسام هاشم السقا مشرف الموقع : أ. خالد محمد الأدغم الكلية: العلوم القسم: الفيزياء وصف المساق: الشحنة الكهربائية -- قانون كولوم -- المجال الكهربائي -- الفيض الكهربائي -- قانون جاوس -- الجهد الكهربائي -- السعة والمكثفات -- التيار الكهربائي -- المقاومة -- قانون أوم -- توصيل المقاومات -- قواعد كيرتشوف -- دوائر RC -- القوة المغناطيسية -- المجال المغناطيسي- قانون بيوت-سافارت -- قانون أمبير -- الحث الكهربائي -- قانون فاراداي- قاعدة لنز -- المحاثات الكهرومغناطيسية -- دوائر LC -- -- دوائر RLC -- دوائر التيار المترد -- الرنين الكهربائي -- الموجات الكهرومغناطيسية. مركز التميز والتعليم الإلكتروني: http://lectures.iugaza.edu.ps/ http://elearning.iugaza.edu.ps/ قائمة محاضرات المساق: http://www.youtube.com/playlist?action_edit=1&list=PL9fwy3NUQKwZKGKQcBBh_...
Dr Mike Young goes into detail about electrical current, resistivity, resistance and electrical power.
Electrical resistivity (also known as resistivity, specific electrical resistance, or volume resistivity) is an intrinsic property that quantifies how strongly a given material opposes the flow of electric current. A low resistivity indicates a material that readily allows the movement of electric charge. Resistivity is commonly represented by the Greek letter ρ (rho). The SI unit of electrical resistivity is the ohm⋅metre (Ω⋅m) although other units like ohm⋅centimetre (Ω⋅cm) are also in use. As an example, if a 1 m × 1 m × 1 m solid cube of material has sheet contacts on two opposite faces, and the resistance between these contacts is 1 Ω, then the resistivity of the material is 1 Ω⋅m. Electrical conductivity or specific conductance is the reciprocal of electrical resistivity, and measure...
Ground Water Hydrology by Dr. V.R. Desai & Dr. Anirban Dhar,Department of Civil Engineering,IIT Kharagpur.For more details on NPTEL visit http://nptel.ac.in
The electrical resistance of an electrical conductor is a measure of the difficulty to pass an electric current through that conductor. The inverse quantity is electrical conductance, the ease with which an electric current passes. Electrical resistance shares some conceptual parallels with the notion of mechanical friction. The SI unit of electrical resistance is the ohm (Ω), while electrical conductance is measured in siemens (S).
An object of uniform cross section has a resistance proportional to its resistivity and length and inversely proportional to its cross-sectional area. All materials show some resistance, except for superconductors, which have a resistance of zero.
The resistance (R) of an object is defined as the ratio of voltage across it (V) to current through it (I), while the conductance (G) is the inverse:
For a wide variety of materials and conditions, V and I are directly proportional to each other, and therefore R and G are constant (although they can depend on other factors like temperature or strain). This proportionality is called Ohm's law, and materials that satisfy it are called ohmic materials.