- published: 07 Nov 2016
- views: 486154
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:
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 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/B06ZZHKWBF/afromods-20 Adjustable power supply: http://www.amazon.com/exec/obidos/ASIN/B00LG1TGSE/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://www.facebook.com/Afrotechmods...
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?
We have explained here what is resistance and what is the basic theory behind it.
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.
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...
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.
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...
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 ...
Covering resistance, how to calculate resistance, resistance in wires and resistors in series and parallel.
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.
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/
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
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.
This video about of resistance (प्रतिरोध) You can clearly understand in this video Whats the basic of resistance in hindi language
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.
Trying to explain resistance!
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
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...
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/
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
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.
ZOGPhysics 435 - Electrical Circuits Revision - Current, Voltage and Resistance
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 ...
http://www.mediafire.com/file/84j7emp29chcl9r/Zag+prep+Electric+current+.pdf
Chapter 17 overview of current and resistance
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...
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 is the first tutorial of a Naval / Industrial electrician training series. topics included : Electricity, Voltage, Current and resistance.
ZOGPhysics 434: Current Electricity 04 - Resistance
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
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_...
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
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
0:00 discussion of clicker points and HW makeup assignment 5:00 reading quiz 8:00 intro to electronic properties 9:45 electrical conductivity as a flux with a driving force and constant of proportionality (just like mass and heat fluxes) 15:52 resistivity vs resistance, geometry considerations 21:15 joule heating 23:13 worked example of joule heating 30:47 worked example of sample temperature rise due to joule heating 41:59 Ashby diagram and the broad range of electrical resistivity values 45:33 why do energy bands form in solids?