Question

what do you mean resistance also give the formula and unit it. ​

Answer 1

resistance is the ability of the object to oppose the flow of charges
resistance has a unit ohm
R= resistivity×length/area of cross section

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Answer 2

Resistance is the opposition that a substance offers to the flow of electric current. It is represented by the uppercase letter R. The standard unit of resistance is the ohm, sometimes written out as a word, and sometimes symbolized by the uppercase Greek letter omega:

$\omega$