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What is an electric resistance ? Give note on it.

Answer»

Solution :* 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 prop (l)/(A)`
* `(R=rho((l)/(A)))` Where, `rho=`equilibrium constant The constant of proportionality.
`rho` (Greek, rho) is called resistivity (specific resistance).
* The electrical resistance is represented by the SYMBOL .R. and it is measured in ohm `(Omega)`.
* Its SI base units is equal to ` (kg" " m^(2))/(S^(3)A^(2))`. It can be measured with the help of a Wheatstone BRIDGE.
* Where, A=area and S=time
1 ohm `=1Omega=1(kg" "m^(2))//(S^(3)A^(2))`
`1Omega" "m=100Omega" cm or "1Omega" cm"=0.01Omegam`


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