R = (density)(Length)/(Area)
Unit of resistance is Ohms.
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You don't specify diameter. I am assuming it is the same. However, the larger the wire the lower the resistance. Temperature affects resistance. The hotter the wire, the higher the resistance. You also don't specify the layout of the wire. For example you could make a coil or choke with one wire.
if length is doubled then resistivity increases&when area is doubled resistivity decreases.
There is no formula to calculate the length of a wire. The length of a wire is determined by the distance from the power source to where the load is situated.
When i will be a pro will help
A shorter length