Question

on what factor resistor of conductor depends

Answer 1

hey mate it'll be resistance not resistor and according to it resistance of a conductor depends on the area of cross section of the conductor as it is inversely proportional to the area of cross section

hope it helps..!!!

Answer 2

$\huge \boxed{ANSWER}$

◼$\mathcal{RESISTANCE}$

Resistance is refered to the obstruction offered in the path of the current.

◼$\mathcal{SI \: UNIT}$

Unit of resistance is Ohm $\omega$

The resistance of a conductor is said to be 1 ohm if 1amphere current flows through it when the potential difference of 1 volt is applied across the conductor..

1 ohm =$\frac{1 volt }{1 amphere}$

◼$\mathcal{FACTORS \: AFFECTING \: RESISTANCE }$

▶MATERIAL OF WIRE.

Different material have different concentration of free electrons and therefore the resistance of the conductor depends on its material .

Metals like silver, copper aluminium, lead etc. have the concentration of free electrons in the decreasing order, so their identical wires offers resistance in increasing order.

▶ ON THE LENGTH OF CONDUCTOR.

In long conductor, the number of collision of free electrons with the positive ions will be more compared to a shorter one. Therefore, a longer conductor offer more resistance. So, the resistance R is directly proportional to length L.

$R \propto L$

▶ON THE AREA OF CROSS SECTION.

in a thick conductor, electrons gets a larger area of cross section to flow as compared to thin conductor, therefore a thick conductor offers less resistance. The resistance R is inversely proportional to area of cross section A .

$R \propto \frac{1}{A}$

▶ON TEMPERATURE OF CONDUCTOR.

With the increase in temperature of a conductor, the random motion of electrons increases. As a result, the number of collisions of electrons with the positive ions increases. Hence, the resistance is conductor increases with an increase in its temperature.