The electrical
resistance is represented by the symbol ‘R’ and it is measured in ohm (W)
which in terms of SI base units is equal to (kg m2)/(S3 A2) It can be
measured with the help of a Wheatstone bridge with which you are
familiar from your study of physics The electrical resistance of any object
is directly proportional to its length, l, and inversely proportional to its
area of cross section, A That is,
R µ l
A  or R = r l
A
(2