Resistivity and Resistance Formula, Conductivity, Temperature Coefficient, Physics Problems
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- เผยแพร่เมื่อ 21 ก.พ. 2017
- This physics video tutorial explains the concept of resistivity and resistance of electrical conductors like copper and silver as well as semiconductors such as silicon, germanium, and carbon graphite. It provides the formula to calculate the resistance of a metal or wire using resistivity. It discusses the inverse relationship between resistivity and conductivity as well the direct relationship between resistance and temperature. Electrical conductors such as metals have a positive temperature coefficient of resistivity which means that as the temperature of a metal increases, the resistivity will increase and the conductivity will decrease. For metalloids or semiconductors, the opposite is true. These elements have a negative temperature coefficient which means that the resistance will decrease as the temperature increases which correlates to an increase in conductivity. The resistivity depends on the length of the wire as well as the cross sectional area. Long wires have more resistance and short wires conduct electricity better. Thick wires have less resistance than thin wires. This video shows you how to calculate the temperature by simply measuring the current in a metal using a known voltage which has practical applications in digital thermometers.
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The Electric Battery:
• The Electric Battery a...
Ohm's Law Problems:
• Ohm's Law Explained - ...
Resistor Color Code:
• Resistor Color Code Ch...
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Internal Resistance of a Battery:
• Internal Resistance of...
Electromotive Force of a Battery:
• Electromotive Force of...
Drift Velocity and Current Density:
• Drift Velocity, Curren...
Potential Difference Between Two Points:
• Potential Difference B...
Alternating Current Vs Direct Current:
• Alternating Current vs...
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Schematic Diagrams & Symbols:
• Schematic Diagrams & S...
Open, Closed, and Short Circuits:
• Open Circuits, Closed ...
Resistors In Series:
• Resistors In Series - ...
Resistors In Parallel:
• Resistors In Parallel ...
Physics PDF Worksheets:
www.video-tutor.net/physics-b...
Final Exams and Video Playlists: www.video-tutor.net/
Hello Sir! Can you recommend me some books where I could find some more practice problems about this?
Thank you!
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Are calculators allowed?
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You are a god! My teacher couldn't even teach me this and I've been doing this in college for the last 4 weeks!
Thank you so much for this video, I was stuck on a problem involving the top equation at the 11 minute mark. I was given the resistances and one of the temperatures and I had to find the other T and I never would have been able to do it without you showing the bottom equation in the red box with R instead of rho. Thanks again!
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Air conditioning units are mostly used during summer period. A simple electrical circuit may represent the set-up of the aircon: a rheostat connected in series with the whole cooling mechanism (represented by a single resistor) and these combination is then connected in series with the power switch. The whole circuit is supplied by a 220 V power supply. The following are the values of the components: rheostat (10 ohms to 10,000 ohms) and the cooling mechanism (100 ohms). By theory, the higher the power consumption of the cooling unit, the higher the current flowing in the cooling mechanism. Given the following scenarios, answer the following:
b) Let us assume that the current value of the rheostat is 1000 ohms. Assuming that the value of the total current represents the current temperature (2 A for 18 degrees and 0.2 A for 25 degrees). Draw the electrical diagram and calculate the temperature at 1000 ohms.
helped me a lot since high school and still now in college thanks!
watching your videos from India
Thanks for your help
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Learnt so much in such a small period of time thank you
I totally agree. Our teacher hardly teaches our class but this has helped me alot.
This video is so good! I just had a question... Are there standards for the temperature coefficient of materials? Could you theoretically work out the resistance of wires at a certain temperature without knowing the specific temperature coefficient?
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Nice video . Understood everything .
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this was a very great video and i learnt a lot from you today, thanks .... But what's up with the siren from 14:00 to around 14:40
i fing love you , can you post some question to solve ? that would be great as a practice work . thanks in advance
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use the water analogy. voltage is pressure current is water resistance is the valve or in this case wire. longer the pipe the more water is needed to get to the other side meaning higher resistance. smaller pipe will transfer even less current/water so higher resistance and vice versa
Thanks for explaining so succinctly. Understood everything
Teacher forgot by saying 'p' for resistivity throughout , it's actually greek 'rho' ( Greek R )
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Thank you so much!
I have a question at 16:50 when you wanted to calculate voltage drop for a 300m copper wire length. Why did we divide V by 15 when we wanted to calculate voltage drop for 15 meters, but then multiply it by 300 when we wanted to calculate voltage drop for 300m? Shouldn't we take the original resistance at 20 C (1.783 mv) and divide it by 300m instead?
0.119 mV is voltage per meter so for 300meters will be 0.119 x 300
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1:11 2) the energy that is present in the electrons when travelling from source to end point is lost midway so not all electrons will pass through
At min 12.56 you calculate the area as pi(3*10^-3)^2 but we got told to do pi(3*10^-6) Which gives you a different result. I had this same thing repeated in university as well.
You have to square everything in the brackets, so (3*10^-3)^2 becomes 9*10^-6 rather than (3*10^-6)
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No problem
I have a question, I'm working through my Electrotechnics N4 model now and am busy with resistivity. I have the length of a wire which is 25 but in my example in the handbook, where R=PL/A, they still timed Lx2 to give a length of 50m which I don't understand why. Think you can help?
Given Rm = .74 @ 20 Celsius, what will Rm equal at BHT if Total Depth is 2400m and the
Geothermal Gradient is 2 Celsius/100m (Surface temperature 20 Celsius) ?
super
Hi, just a question to do with the difference between single-core cable and twin cable. If you have a Cross-Sectional-Radius (CSA) on a cable of 2.5mm and it is a twin cable, do you double the Cross-Sectional-Raduis (CSA) to 5mm as you are sending a set voltage( Let’s say 230v for me in the UK) down 2 cables, in which case you half the voltage as it’s going down 2 separate cables?
Because this would then change the value of resistance at the end of the circuit.
Cheers
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im in need of a calculator for my exams, got any suggestions on what to buy, scientific or Graphical?
I got temp as 34.7 . Is it close enough cause I don't want to use more than 2 decimal places (I can't use calculator in exams)
Someone clear my confusion please. Isn't R0 supposed to be the resistance at 0 C?? So, aren't we su[pposed to do it the other way?The alpha s will cancel and then by putting the values we can get the answer. In my book, two different tempuratureds are given and one of the resistance in one of those two twmpuratures are given. We are asked to find tempurature coefficient. So, they didn't put the 25C (which is R1) in place of R0..cuz that's suppposed to be the resistance at 0C.
should have paid my college tuition to you🤣thanks a lot OCT
Is there a technique to memorizing resistivity of materials
Thanks helped alot....
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Hello, I was hoping you could help me possibly. I was planning on maybe getting into some silver and gold purchases and learned of the rather large problem with fake metals being placed inside gold and silver products . However I also learned that there is a device called a sigma metalitics precious metals verifier the will test metals authenticity based on resistivity. Well knowing that the multimeter tool from the store costs like 40 bucks and measures resistivity ohms and all that stuff and that this gold tester costs over $2,500 dollars I was wondering,.... well I've been pondering that there must be a way using equations such as yours to verify a metal resistivity and thereby the metal itself since they all have a different resistivity .... such as taking a reading from the multimeter and then performing an equation on it that should always come out to that metals exact resistivity..... otherwise it would not be authentic gold or silver.... There has to be a way... that must be what they are doing with the expensive machine.... im sure you figured out by now I am wanting to use the resistivity test using the math equations and $40 tool rather then the $2500 dollar tool. What equations' for a coin and bar would I use.... always at room temp... to determine if the metal is authentic.... I am thinking that if I know the equations I should be able to use a multi meter and do the calculations myself with a calculator rather than paying 2500 dollars for something to do the calculations for me.. That's one high priced calculator. Please let me know and Much Thanks For Any Help You Can Provide to me!!!!!!
Is it necessary to press the "ENG" button on the calculator in getting the final answer? For what I know the answer is still the same.
Thanks I’m studies Biomedical Engineering
Very nice explanation 👌👌but in very low voice 😔😔
thank u!!!
Find the resistance of an iron rod 2 cm in diameter and weighing 3 kg.?
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How to know what will be the P's value?
Very nice explanation but very low voice recording
THANK YOU⭐️!
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I just love how he doesn't like any comment or heart it / pin .
Just reading it nd being happy
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New superconductor just dropped, feeling curious
I am trying to calculate alpha in my course, i am just missing the algebra steps and cant find it anywhere
How do u write it on a calculator? Im getting a different answer...
thank you sir
could someone explain how 9:31 . how to compute it? i still dont understand
❤️❤️
what if it the material was not stated in the problem but it gives the ohms