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. Resistance: It is the opposition offered by a conductor to the flow of electric current, through it. Its SI unit is ohm (Q)., , Resistance is also defined as the ratio of potential difference applied across the ends of the conductor to, the current flowing through it., , Mathematically, R = “, , e, , Vt ne2tAV, Also, I = neavg = “a CNA = —, , ml, , >, , V_ ml ml, I, , ~ ne2tA ~ ne2tA, , . _Cause of resistance: it is due to the collision of free electrons with ions or atoms of the conductor, while drifting towards the positive terminal of the conductor.