- published: 07 Nov 2016
- views: 249658
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.
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.
Resistance may refer to:
A tutorial on the basics of resistance, resistors, and Ohm's law which describes the relationship between voltage, current and resistance. I also show you how to build a simple resistor + LED circuit. 300 LEDs for $13: http://www.amazon.com/exec/obidos/ASIN/B00UWBJM0Q/afromods-20 500 resistors for $12: http://www.amazon.com/exec/obidos/ASIN/B008MH97I4/afromods-20 9V battery clips: http://www.amazon.com/exec/obidos/ASIN/B0188X6C2U/afromods-20 Adjustable power supply: http://www.amazon.com/exec/obidos/ASIN/B006W209ZG/afromods-20 Previous video on LEDs: http://www.youtube.com/watch?v=Yo6JI_bzUzo Next video on power and watts: http://www.youtube.com/watch?v=VSpB3HivkhY Website: http://www.afrotechmods.com Twitter: http://twitter.com/afrotechmods Facebook: http://bit.ly/2cMrAeu Ohmnilabs: htt...
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?
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
We have explained here what is resistance and what is the basic theory behind it.
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.
Georg Simon Ohm (16 March 1789 -- 6 July 1854) was a German physicist and mathematician. As a high school teacher, Ohm began his research with the new electrochemical cell, invented by Italian scientist Alessandro Volta. Using equipment of his own creation, Ohm found that there is a direct proportionality between the potential difference (voltage) applied across a conductor and the resultant electric current. This relationship is known as Ohm's law.
Have any doubts? Follow this link http://avanti.in/peerlearning/signup and ask from the experts. It’s free. Class 10 Physics – Electricity Electricity is everywhere around us. We use so many appliances in our daily lives which are driven by electricity. How a fan starts working when you switch it on, the lights turn on when you switch them on. You all know that this is electricity which is making all this happen. But what is electricity? How it travels in the wires? What is the constituent of this electricity? All these questions will be answered in this chapter. Here, we’ll learn 1. What are charges? 2. What is electric potential and electric current? 3. Ohm’s law experiment. 4. What is ohm’s law and what is a resistance? 5. What is resistivity and how it changes with temperature? 6. Comb...
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.
Mr. Andersen describes the relationship between voltage, current and resistance in an electric circuit. Ohm's Law is introduced through a circuit simulation. Intro Music Atribution Title: I4dsong_loop_main.wav Artist: CosmicD Link to sound: http://www.freesound.org/people/CosmicD/sounds/72556/ Creative Commons Atribution License
Let's try a simple but shocking experiment to try to wrap our heads around resistance, and what these little resistors do.
USED TO DETERMINE ANTI-STATIC PROPERTIES OF SHOES
Trying to explain resistance!
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...
Introduction to electricity, circuits, current, and resistance. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/physics/circuits-topic/circuits-resistance/v/circuits-part-2?utm_source=YT&utm_medium=Desc&utm_campaign=physics Missed the previous lesson? https://www.khanacademy.org/science/physics/electric-charge-electric-force-and-voltage/electric-potential-voltage/v/electric-potential-at-a-point-in-space?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 of physics, you'll need...
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...
Useful for CBSE, ICSE, NCERT & International Students Grade 07 Subject: SCIENCE Lesson : Electric Current and its Effects 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.
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 ...
What comes to mind when you think of electricity? Current, voltage and resistance. What affects the resistance? What makes a conductor be what it is and for that matter, how is it different from an insulator? What happens when the kinetic energy of electrons is gone? Learn about electricity and resistance in a very interesting way through this module. Electricity can be defined as the movement of charged electrons or the charged protons, dynamically as a current. The charged electrons create charge, which are bind together to do work. The electric bulb, fan and other electronic equipment’s work by binding the electrons. Electricity is measured in units of power called as Watts and it is denoted by the letter W. Current can be defined as the rate at which the charge is flowing. An elec...
Gives the definition, units and abbreviations for voltage, current and resistance. You can see a listing of all my videos at my website, http://www.stepbystepscience.com
The electrical resistance of a copper coil is dramatically decreased by cooling with liquid nitrogen.
Electrical Resistance, Reactance and Impedance, including resonance in LRC circuits.
3 calculation examples step-by-step
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.
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.
Dr Mike Young goes into detail about electrical current, resistivity, resistance and electrical power.
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
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...
This procedure is tedious, but it requires very little fancy math and it's conceptually beautiful. You ought to be able to look at the finished product and explain WHY the values of voltage drops and currents for each resistor and combination of resistors have the relationships they do. Yay! You can now simplify any circuit with just one battery and a bunch of resistors...or can you? Those in the know call this finding the Thevenin Equivalent circuit, 'cause the method was proven by Thevenin long ago. Want more? This is part of a larger playlist on circuits: https://www.youtube.com/playlist?list=PLLUpvzaZLf3IM2wmkH0TcDRzkN3joR5Af I have actually made a bunch of physics videos. Feel free to find my other playlists if you're lonely on a Saturday night. Or if you just want to know s...
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.
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_...
Physics (Grade 10): Current Electricity- Resistance and Ohm's Law; High School Learning: Current Electricity, - Resistance, - Factor affecting resistance, - Ohm's Law, - Validity of Ohm's Law, - Nature of conductor, - Conductor,Semiconductor,Insulator. - Length - R is directly proportional to I. - R is inversely proportional to A. - Temperature of Conductor. Current pd Resistance Videos by Edupedia World(www.edupediaworld.com), Online Education, Click on (https://www.youtube.com/playlist?list=PLJumA3phskPFLg8Ad50UbcyTYkaJXd-Q3) for more Videos. All Rights Reserved.
Ohm's Law, current, voltage, resistance, energy, DC circuits, AC circuits, resistance and resistivity, superconductors.
Dr Mike Young goes over Exam 1 for his Physics 122 class. He continues his introduction to electrical current and resistance. Covers series and parallel resistor combinations.
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
شرح لمادة فيزياء لغات للثانوية العامة من قناة مصر التعليمية مع الاستاذ مجدي عبد اللطيف \الاستاذ محمود عامر رابط قائمة التشغيل لمنهج فيزياء لغات كاملا : https://www.youtube.com/playlist?list=PLXyvQwqox6HVP1A_Iv5jMZD9o_ZCdwMMG هام جدا | نرجو منكم الاشتراك في القناه البديله :https://www.youtube.com/channel/UCsLiGO0dugmxoYD2jzF-3qw غفر الله لكم . ليصلك الجديد بأذن الله . أضغط على أشترك أوSubscribe التى بالقناة = بسم الله === فضلا وليس امرا قيم العمل والمجهود بالضغط على like أو أعجبنى - أسفل الفيديو ولا تنسونا اخوتى من صالح دعائكم عن ظهر غيب هذه المواد للنشر فى كل مكان واحتساب الأجر ولا نريد نسبها لأحد ولكن رجاء عدم تغيير محتواها ونسألكم الدعاء لمن كان سبب فى نشر هذه المواد بظهر الغيب قال رسول الله صلى الله عليه وسلم: "من دل على خير فله مثل أجر فاعله" [ رواه مسلم ] قال النووي (رحمه الله): "...
Michael D. A. Thomas, Professor, University of New Brunswick, Fredericton, NB, Canada Electrical methods such as surface resistivity, bulk resistivity, and electro-impedance spectroscopy are becoming more prominent to monitor concrete condition in laboratory and field applications, as illustrated through increased interest from infrastructure management agencies and the commercial availability of testing equipment sets. This session will present recent advances of such technology with potential application to nondestructive testing (NDT) and in-place structural monitoring for concrete.
This is the first tutorial of a Naval / Industrial electrician training series. topics included : Electricity, Voltage, Current and resistance.
The lecture contains introduction to resistance ,ohm's law resistance combination i.e series and parallel and electric power! below link list of conductivity of metal link :http://www.tibtech.com/conductivity.php please feel free to comment and any suggestion.
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 ...