Physics Assignment Help With Resistance
Resistance is the property of a substance by which it opposes the flow of current through it.
For a given body, the resistance is defined as the ratio of applied potential difference to the resulting current,
This property of the substance is due to frequent collisions of electrons with the atoms of the conductor.
SI unit of resistance is named ohm ) which is equivalent to V/A. Its dimensions areW(
[R] = .
12.6.1 Dependence of Resistance on Physical Dimensions
For a given body, its resistance is found to be
- directly proportional to its length (L), and
- inversely proportional to its area of cross-section (S).
That is, R µ L and R µ
or R µ = r
where r is a constant called resistivity.
12.6.2 Resistivity or Specific Resistance (r)
The constant r is the characteristic of the material depends on its temperature of which the conductor is made. If L = unity and S = unity, then
R = r
It can also be defined as the resistance of a cube of material of side 1 m when current flows perpendicular to opposite faces.
The SI unit of resistivity is ohm metre (W m).
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