Wire resistance calculation

Discussion in 'General Electronics Chat' started by ajitnayak87, Aug 24, 2015.

  1. ajitnayak87

    Thread Starter New Member

    Dec 30, 2013
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    0
    Dear all,

    I am trying to impliment the online calculator on excel sheet.
    here is online calculator
    http://www.bulkwire.com/wireresistance.asp

    i follwed below method to calculate but i cant getting same answer http://www.rapidtables.com/calc/wire/voltage-drop-calculator.htm

    can some one explain how to get value using below perameter as example

    length of cable is= 50 feet

    load current = 6A

    source voltage =12v


    consider 24 guaze wire perameter


    diameter in inch given=0.0232 inch

    diameter in mm is given as=0.590mm

    resistance @77 deg F=26.18 ohm/ft

    resistance @77 deg F= 85.9 ohm/km



    how to calculate resistance for length;voltage drop; % voltage drop??

    what are right perameter to be used to exact answers
     
  2. DickCappels

    Moderator

    Aug 21, 2008
    2,658
    632
    resistance of a length of wire in ohms = (ohms/meter) x (length or wire in meters)

    voltage drop across length or wife = (resistance or length of wire) x current

    % voltage drop = 100x ( voltage drop across length) / total applied voltage)


    The resistance in feet should be 26.18 ohms/1,000 feet

    Your task will be easier if you choose one measurement system or another and stick with it. Ohms per km @ 77 °F looks kind of funny.
     
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  3. ajitnayak87

    Thread Starter New Member

    Dec 30, 2013
    8
    0
    The resistance in feet should be 26.18 ohms/1,000 feet

    Ok i am mentioned as defined in link. I dont know which value being used in calculator link . So I told using these perameter from link how can i get

    output data :
    resistance for length=1.30912
    voltage drop =7.85472
    out put voltage source drop=4.14
    percentage loss= 65.46

    Input parameter in calculator are

    length of cable is= 50 feet

    load current = 6A

    source voltage =12v
    http://www.bulkwire.com/wireresistance.asp
     
  4. gerty

    AAC Fanatic!

    Aug 30, 2007
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  5. ronv

    AAC Fanatic!

    Nov 12, 2008
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    You cannot calculate it because the wire resistance is to high to allow 6 amps to flow at 12 volts.
    The resistance of 100 feet of 24 awg is about 2.6 ohms so the most you could get with 12 volts is about 4.6 amps.
     
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  6. crutschow

    Expert

    Mar 14, 2008
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    3,237
    You need a lot larger wire than 24 gauge to carry 6A for 50 feet with a reasonably small voltage drop.
     
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  7. #12

    Expert

    Nov 30, 2010
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    Is there an app for that? :D

    Today's kids!:rolleyes:
     
  8. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
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    I'm still amazed at Dick's voltage drop across length or wife
     
  9. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Don't most wives offer resistance? ;).
     
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  10. DickCappels

    Moderator

    Aug 21, 2008
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    Don't get me started on that subject...
     
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  11. Gdrumm

    Distinguished Member

    Aug 29, 2008
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    You guys crack me up
     
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  12. ronv

    AAC Fanatic!

    Nov 12, 2008
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