Question

Why do we use the same resistance in this question to find our new current.. By ohm law the resistance should decrease but here we assumed same resistance... Why!???????

Pls answer fast! Tomorrow is my test!

Answer 1

Hey there,

Its not necessary you change the resistance. You can also change the voltage applied.

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Answer 2

Ohm's Law states that the current flowing through a conductor is directly proportional to the potential difference across the conductor.

The constant of proportionalilty is called conductance.

Conductance and Resistance are related according to the following expression :

$conductance \: = \: \frac{1}{resistance}$

Resistance of a conductor depends upon the dimensions of the conductor and specific Resistance of the conductor material.

$resistance \: = \: s \frac{l}{a}$

where

s = specific resistance of conductor material

l = length of the conductor

a = area of the conductor


So, resistance remains same. (in the question)