Question

IF WE HAVE A LONGER WIRE SO DOES WE SHOULD ADD MORE THAN 1 RESISTANCE IN IT??

DOES IT IS NECESSARY TO ADD MORE THAN 1 RESISTANCES IF WE HAVE A LONGER WIRE??​

Answer 1

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The electrical resistance of a wire would be expected to be greater for a longer wire, less for a wire of larger cross sectional area, and would be expected to depend upon the material out of which the wire is made.The resistance of a wire can be expressed as R=ρ

A

L

,

where,

ρ - Resistivity - the factor in the resistance which takes into account the nature of the material is the resistivity

L - Length of the conductor

A - Area of cross section of the conductor.

From this relation, we observe that the length is directly proportional to the resistance and the area of cross section is inversely proportional to the resistance.

That is, if L becomes 2 L, R becomes 2 R. R

′

=ρ

A

2L

. So, R = 2R'.

Hence, If the length of a wire is doubled, then its resistance becomes 2 times.

Answer 2

First, the total length of the wires will affect the amount of resistance. The longer the wire, the more resistance that there will be. ... In the same manner, the wider the wire, the less resistance that there will be to the flow of electric charge

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