Custom Servo Extensions - Page 3 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 02-03-2004, 09:15 AM   #21
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Here is a small selection from a copper wire resistance chart - AWG vs Ω per ft.

16 .00473
18 .00751
20 .0119
22 .0190
24 .0302
26 .0480
28 .0764

If the length is significant (remember it's the length of the lead X 2) then AWG 20 will result in less voltage drop, hence better servo performnce.

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Old 02-03-2004, 01:21 PM   #22
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Lets look at an extreme case. A 5 foot long extension with 250ma current draw. Most standard servos are likely in the 100ma to 150 ma range so 250ma should be more than adequate. As you have 2 conductor wire you are looking at 10 feet of wire. The resistance difference between 22AWG and 20AWG is .0071 X 10 feet for a total increase in resistance due to cabling of .071 ohms. Multiply that by 250ma and you get 17.75mv or .0178 volts. Less than 2/100 of a volt. I don't think that I would worry about it unless you are using extensions that are very long and big 1/4 scale servos that have even greater current requirements. IMHO only of course.
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