When is cable resistance bigger – long/thin or short/thick wire?

Question

which has more resistance: long and thin or short and thick cable ?? PS. Just getting started :)

emes · Accepted Answer

R = (ro * l) / s R = cable resistance ro = coefficient - specific resistance l = length s = cross-sectional area Remember about common units. Greetings

Slawi · Answer

Above, a colleague gave the pattern for resistance. According to the formula, the resistance depends proportionally on the length of the cable and inversely proportionally on its width. That is, the longer the conductor is, the greater its resistance, and the thicker it is, the lower its resistance, and therefore the greater the resistance is of a long and thin conductor.

elektronik_tk · Answer

the predecessors are 100% right and it is good that the new electrode person asks such a question, after all, we are here to help.
Well, it should be mentioned that if the wires are made of materials with very different specific resistance, sometimes it is impossible to determine which of the cables has the greater resistance, but rather Krzysztof meant wires made of the same material

kumonryu · Answer

Please advise if it is better to buy a braid for a vinyl shepherd with copper wires with a resistance of 0.07 (Ohm / m) or a steel braid with a resistance of 0.21 Ohm / m. The length of the fence loop is about 1000 meters. Is the above-mentioned difference in resistance will apparently affect the annual electricity consumption and the bill? The energizer on the rating plate indicates the load (max?) of 16W. Vinyl braid has lower resistance but is more prone to breakage, steel braid is much more durable, hence the dilemma of quality vs durability vs cost of ownership. Thank you in advance for your support! Thomas

_jta_ · Answer

And is it supposed to be a power supply cable or a fence? 1000m of the one with the higher resistance will have 210 ?, for the fence it will be nothing.

A separate matter, as with durability, because it is probably solid, it is more susceptible to corrosion (but it has greater mechanical strength until it rusts).

kumonryu · Answer

Thank you, this cable is not a power supply, but a "deterrent" cable to which the current from the shepherd is led (limiting the movement of animals)

In fact, copper is less susceptible to rust, but the vinyl cable under the influence of UV will also deteriorate after some time and the steel cable, as you say, will rust faster (galvanization protects against rust only for a limited time? A year / two / ...?)

When is cable resistance bigger – long/thin or short/thick wire?

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