Wire resistance calculation

Thread Starter

ajitnayak87

Joined Dec 30, 2013
9
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
 

DickCappels

Joined Aug 21, 2008
10,153
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)


resistance @77 deg F=26.18 ohm/ft

resistance @77 deg F= 85.9 ohm/km

(some text removed for clarity)
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.
 

Thread Starter

ajitnayak87

Joined Dec 30, 2013
9
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
 

gerty

Joined Aug 30, 2007
1,305
Dear all,

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

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



24 ga wire will not carry 6 amps, good for 1 amp at best. According to calculator you'll need # 8 wire. And when figuring distance, don't forget the wire has to go from source load and back again. So a load 50 feet from source uses 100 feet of wire.
 

ronv

Joined Nov 12, 2008
3,770
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
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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