explain resistance is equal to rheo into length upon its area
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Resistivity or electric resistivity is certainly the inverse of the electrical conductivity. Resistivity is a fundamental property of a material and it demonstrates how strongly the material resists or conducts electric current. A low resistivity is a clear indication of a material which readily allows electric current. Moreover, the common representation of resistivity is by the Greek letter
ρ
. Also, the SI unit of electrical resistivity happens to be the ohm-meter (
ρ
-m).
Resistivity is certainly the measure of how strongly a particular material opposes the flow of electric current on conductors or resistors with a certain uniform cross-section. Furthermore, uniform cross-section is the one where the current flows in a uniform manner. Conductivity happens to be the reciprocal quantity which is a measure of the easiness by which a material permits the flow of current.
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Resistivity Formula
The resistivity formula can be represented as follows:
Resistivity Formula Derivation
The resistance R is definitely directly proportional to the length of the conductor. What this reflects is that resistance increases with an increase in the conductor’s length.
So, resistance (R)
∝
l (1)
The resistance R is certainly inversely proportional to the area of cross-section of a particular conductor. What this means is that R will decrease with an increase in the area of conductor and vice-versa. More area of the conductor leads to an efficient flow of electric current through more area and consequently decreases the resistance.