Wire Gauge – AWG, Amperage, Diameter Size, & Resistance Per Unit Length

Wire Gauge – AWG, Amperage, Diameter Size, & Resistance Per Unit Length

This electronics video tutorial focuses on the american wire gauge – AWG. It discusses the relationship between wire size, amperage, diameter in mm, and resistance per unit length in milli-ohms per ft. This video also explains how to calculate the maximum voltage that can safely be applied to a wire of a given length and size.

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50 Comments

  1. Frods kaamino on July 10, 2022 at 11:45 pm

    What shoul be the best replacement electrical conductor size when #12AWG is not available? Thanks

  2. HellScythe Necromance on July 10, 2022 at 11:46 pm

    What happens if you run 2 parallel wires in the same direction. how much would it increase by?

  3. Mario Eid on July 10, 2022 at 11:47 pm

    im having truoble understanding the formula, how do you raise 92 by 16/39😵‍💫

  4. COM 87VLOG on July 10, 2022 at 11:47 pm

    Sir. Pureflex wire type NM 2.0mm 60C 600V. At PDX wire type NM 2.0 MM 2C 600V 60 .What is the number of this 2 wire?

  5. Milivoj Zec on July 10, 2022 at 11:50 pm

    This is totally insane!!! No wonder America is the way it is!!

  6. DodkoTheFirst on July 10, 2022 at 11:56 pm

    useless

  7. Brett Bresnan on July 10, 2022 at 11:56 pm

    AWG….bahahahahaha…..Typical American logic. Make something very simple absolutely rediculous.
    When are you going ro wake up and embrace metric like the rest of the world.

  8. JesterKat on July 10, 2022 at 11:56 pm

    I’m relocating my car battery to the trunk of my car from the engine bay, what gauge wire should I be using for the positive lead?

  9. Oria Xu on July 10, 2022 at 11:56 pm

    murrica logic 😀
    Thanks for the video, glad to find some explanation on what i see at home depot… as someone who move to north america i can say: i miss the metric system! Because nothing makes any sense when you ask people to measure things with their fingers, feets, hair, etc! 😀

  10. Kirian Peraza on July 10, 2022 at 11:57 pm

    The start was kinda sus

  11. Inventor on July 10, 2022 at 11:57 pm

    The thumbails and title seems comparison of penis

  12. samo jedan on July 11, 2022 at 12:01 am

    What if I apply lower current on the wire? For example 1.5A. In this case the voltage could be 10 higher. What you sad is, only in case of maximum current. Another factor for the maximum voltage is the thickness of the insulation. As the voltage is higher, the insulation should be thicker.

  13. Kevin Coop on July 11, 2022 at 12:02 am

    Im thinking you got the last answer backward. If resistance stays the same for the 9000’ you will lower amps as voltage goes up. So, the 337 volts is the lowest voltage you can use, not the highest. Also, conductors are rated in 60, 75, and 90C. You chose the lowest values.

  14. Rafael Amigo on July 11, 2022 at 12:02 am

    Excellent explanation. Congratulations

  15. Rich D on July 11, 2022 at 12:04 am

    Thank you for your time and the work which can b a blessing for us trying to keep vintage Dodge 6 volt and other American carb motors.
    A tutorial on resistance and your cool explanation and teaching is appreciated. Los Angeles has no teaching or shop teaching, seems the sitdown keyboard industry has no hands on curriculum.

  16. Stephen Simon on July 11, 2022 at 12:05 am

    amperage isn’t a thing , it is current. you lose credibility by using that term.

  17. boshbosh mag on July 11, 2022 at 12:06 am

    Would you please explain npn and pnp transistors

  18. cralix thegameking on July 11, 2022 at 12:07 am

    So I know that shotgun guage is determined by the diameter of the bore in relation to a steel ball of the same diameter and the guage of the shotgun is determined by how many steel balls for the same diameter of the bore it takes to reach one pound of steel
    What I am trying to find out is how wire guage is determined

  19. Dann Pasia on July 11, 2022 at 12:08 am

    Is it not “gage”, not “gauge.”? Gage is about thickness or size, but gauge is a out instrument or device for measuring something, like a pressure gauge.

  20. Freddie Madaraog on July 11, 2022 at 12:09 am

    This video misleads technicians.

  21. Northern Pike on July 11, 2022 at 12:11 am

    DISTANCE OR LENTH IS A BIG FACTOR ALSO

  22. Akram Rabah on July 11, 2022 at 12:12 am

    I am still puzzled why the AWG goes up to represent lower amp instead of higher AWG translate to higher amp?

  23. William Velazquez on July 11, 2022 at 12:15 am

    Do I need to use same 2 awg I use from my alternator to the batterie and use the same size from my secondary batterie to my amplifier or I can use another one base on the amplifier watts?

  24. Jack Hoffman on July 11, 2022 at 12:15 am

    My wives answer to what AWG is would probably be…AWG is what a dog does with its tail.

  25. pattayaguideorg on July 11, 2022 at 12:19 am

    Man… that was so helpful, thank you.

  26. Kieran Donnelly on July 11, 2022 at 12:21 am

    I must of worked something out wrong here. If I’m running 1ft of 4 AWG wire, apparantly it can only handle 0.0175 volts? So if I’m connecting 2 batteries together in a bank with 4 AWG wire, I need 690ft to handle the 12v, surely not? I don’t know I’m very new to all this.

  27. Muhammad Nashirudin on July 11, 2022 at 12:22 am

    nice vidio
    but I have Question : how to determine the ampere of current in an electric motor design??

  28. Harold Bullock on July 11, 2022 at 12:22 am

    Very well explained.

  29. roger winter on July 11, 2022 at 12:22 am

    why is an American wire gauge using mm

  30. E & I Knowledge Hub on July 11, 2022 at 12:23 am

    Difficult to understand your concept.

  31. Robert Laster on July 11, 2022 at 12:24 am

    1,5mm 100yds WIRE – 56 rolls of it for only $25 on a auction site. Should I buy it?

  32. Matt on July 11, 2022 at 12:25 am

    why tf would you define AWG using metric?

  33. ryan kalweit on July 11, 2022 at 12:26 am

    10awg max Amp is 35amp

  34. Bunna Tang on July 11, 2022 at 12:27 am

    damn. I have 2 meters wire of 4mm^2 and plugged to 220vac for water heater of 3.5KW. that will be too much? is it nonsese to use : I*R=Vmax?

  35. Jack Hoffman on July 11, 2022 at 12:27 am

    Good video..learned what I wanted & hopefully more.

  36. Bingo Sun Noon on July 11, 2022 at 12:29 am

    I always use circular mils for amperage estimates. Why don’t you?

  37. uncle larry on July 11, 2022 at 12:29 am

    Omg, this video solidified my decision to become an engineer. I work for a telco and the techs deny any logical concept “ANY LOGICAL CONCEPT!” For example a technician told me that a wire that was 10AWG and roughly 10ft long could safely conduct 14,000v without melting to a puddle

  38. Javier A. Rivero P. on July 11, 2022 at 12:30 am

    could you share the chart you are using? because there are a lot of tables on internet with totally diferent ampacity values… i guess i would take the worst case (lower value), but i wanna know the most precise values.

  39. Atreus Shimada on July 11, 2022 at 12:31 am

    Hi, can someone help me how to calculate the current carrying of a wire? it says that a current-carrying copper wire has an electric field of 0.560 v/m with a diameter of 0.750 mm. What is the wire’s current carrying capacity?

  40. Rachel Grubb on July 11, 2022 at 12:31 am

    you talk really really slowly ! very painful!

  41. Ganesan Muthi Ganesan Muthi on July 11, 2022 at 12:34 am

    We use wire gauge to decide the amps or amps to decide the wire gauge. Please give the formula. But using amps to decide the wire gauge is better.

  42. Northern Pike on July 11, 2022 at 12:36 am

    yes ohms per ft and the resistance gd vid

  43. viren chocha on July 11, 2022 at 12:36 am

    your channel name is The organic chemistry tutor…seems you are good at electricity also !!

  44. Buddy Morgan on July 11, 2022 at 12:37 am

    How do I tell the size of a wire without it being labeled

  45. Oliver Taylor on July 11, 2022 at 12:39 am

    Bull shit man,all youre doing is complicating shit to a point nobody can understand it.apparently you never wired a fucking dog house.

  46. Adam Zaidi on July 11, 2022 at 12:39 am

    That kinda does not look like a wire.

  47. James 1:19 on July 11, 2022 at 12:41 am

    Thank you so much. I’m installing a Backup generator to run my house and I have been having the hardest time doing the math on the cable from the Generator to the house. I’m putting it 126 feet from my ATS and I couldn’t find a chart with length over 50ft.
    Again thanks.

  48. Fiskur Tjorn on July 11, 2022 at 12:41 am

    Electrical wire diameters are measured in mm squared (mm²). I missed this in the explanation. Someone unaware of this will find strange values measuring diameter relying only on the numbers on a caliper

  49. Richard Murray on July 11, 2022 at 12:43 am

    I am assuming this is for solid core wire such as romex, and not twist core like in an extension cord.

  50. Milton Phan on July 11, 2022 at 12:43 am

    This was exactly what I was wanting to know how to do. Thank you for the information and you made it very easy to follow.

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