2007-07-09 11:45:52 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
Well I need there to be as little resistance as possible because for my use, the current needs to be within a small window. The difference would be maybe a 10-20 foot difference.
2007-07-09 12:00:17 · update #1
YES. Resistance increases as the length of a conductor gets longer and as its cross-sectional area gets smaller. That is for any given material at any given temperature.
2007-07-09 13:11:09 · answer #1 · answered by Rich Z 7 · 0⤊ 0⤋
Yes because copper wire is not a perfect conductor. It depends on what you're doing though as to whether you really have to account for that or not. I never had to take anything beyond basic circuits classes but in those classes we just assumed the resistence of the wire to be zero even though it wasn't. I'm not sure how much the wire is factored in in real applications.
2007-07-09 18:52:01 · answer #2 · answered by Nate M 2 · 0⤊ 0⤋
The electrical restivity of copper is about 1.678 x 10^-8Ωm
To calculate the resistance of a copper wire you would need the length in meters and the crossectional area in square meters.
The electrical resistivity Ï (rho) of a material is given by
Ï = RA/L
where
Ï is the static resistivity (measured in ohm metres, Ωm);
R is the electrical resistance of a uniform specimen of the material (measured in ohms, Ω);
L is the length of the specimen (measured in metres, m);
A is the cross-sectional area of the specimen (measured in square metres, m²).
2007-07-09 19:33:03 · answer #3 · answered by jsardi56 7 · 0⤊ 0⤋
Yes.
Resistance is due the energy necessary for an electon to move along the surface of the wires molecules
Diameter of the wire and rate of current also effect this
2007-07-09 18:50:43 · answer #4 · answered by Anonymous · 0⤊ 0⤋
To keep it simple If you need lower resistance you need a larger diameter wire.
2007-07-10 21:35:52 · answer #5 · answered by Kevin S 2 · 0⤊ 0⤋
Yes if you double the length the resistance is doubled if the diameter is the same throughout it's length.
2007-07-09 18:49:51 · answer #6 · answered by Anonymous · 0⤊ 0⤋
yes, but the resistance of copper is very low so it won't be a large change unless your adding lots(lotslotslots) of wire.
2007-07-09 18:49:37 · answer #7 · answered by sd d 3 · 0⤊ 0⤋
here are the common copper wires resistance per 1000 ft
#10 awg--- 0.9988 ohms
#11 awg--- 1.26 ohms
#12 awg---1.59 ohms
#13 awg--- 2.00 ohms
#14 awg--- 2.52 ohms
#15 awg--- 3.18 ohms
#16 awg--- 4.02 ohms
#17 awg---5.05 ohms
#18 awg--- 6.39 ohms
#19 awg--- 8.05 ohms
#20 awg--- 10.1 ohms
#21 awg--- 12.8 ohms
#22 awg---16.2 ohms
#23 awg--- 20.3 ohms
#24 awg--- 25.7 ohms
you divide your lenght in feet and you get the corresponding dc resistance, i've been using this data for computing my shunt for small current meters. this table is available in the electrical handbook.
2007-07-09 19:56:43 · answer #8 · answered by jesem47 3 · 2⤊ 0⤋
Yes, but it's a small amount.
2007-07-09 18:53:31 · answer #9 · answered by Anonymous · 0⤊ 0⤋