Question

what is resistance and its factors

Answer 1

resistance is a potential per unit of current
R= V/I

its factors are area of cross section and length of wire

Answer 2

Hey there,

Resistance is the property of a substance by which it resists the flow of current.

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Theoretically, if you would look at factors affecting resistance you have take a look at 2 things-

FIRSTLY, By Ohm's law 
Resistance is the ratio of Potential applied and Current flowing in the circuit.
R=V/I
So V and I affect the resistance in a circuit.

SECONDLY, if you look at physical parameters, we have another formula-
R=ρl/A
So resistance depends on the length and cross section area of the resistor.

There are few more factors like availability of valence electrons, temperature, mechanical stress and strain.

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