Current and the cross-sectional area of ??the wire is proportional to the relationship between the larger cross-sectional area of ??the wire, allowing the greater the current through the same time, and the conductor resistivity, the greater the resistivity, allowing the smaller current, About how much of the specific current can be found in the << electrical manual >> can be found in. The formula is:
Allowed current = (voltage * wire cross-sectional area) / (wire resistivity * length of wire)
The safe flow of the wire is related to its material, and you must look up the table for the exactness of the wire. If you can estimate this:
Copper wire:
10 square below 6-7A / square
10 to 20 square 4-5A / square
20 to 50 square 3-4A / square
50 square to 350 square 1-2A / square
If the materials are made to be 1 meter long and have a cross-sectional area of ??1 mm2, the resistivity (measured as the resistivity of the material) at 20 ° C is compared and compared, the resistivity of silver is the smallest, followed by According to the order of copper, aluminum, tungsten, iron, manganese copper, nickel-chromium alloy, the resistivity increases in turn.
Aluminum conductor resistance is more than 1.5 times the copper wire, its resistivity p = 0.0294Ωmm2 / m, copper resistivity p = 0.01851 Ω · mm2 / m, resistivity with temperature changes will be some differences.
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