Synopsis of Electrical Engineering

Law of Resistance:- Resistance of a substance/ wire : -           Directly proportional to the length, l -           Inversely proportional to the area of cross section. -           As the length of wire increases there is a chance of increase in number of electrons collusions resulting in increase of resistance. -           As the length of wire decreases, number of electrons collusions decreases resulting in decrease of resistance. -           As the cross sectional area of substance/wire increases, electrons get more area to move through resulting in decrease of resistance. -           As the cross sectional area of substance/wire decreases, electrons should move through a congested area resulting in increase of resistance. -           Rαl -           Rα(1/A) -           Combining both the above Rα(l/A) -           Where l is the length of substance/wire and A is the cross sectional area of substance/wire. -           Here, the proportionality constant is