Question

Extension cables are often 30 m long. What would you prefer a thick wire or thin wire for this? Why?

Answer 1

Answer:

thick wire

Explanation:

heating effect increases as resistance increases, and resistance increases as the length increases and thickness decreases. as the wire is already long, the resistance and heating effect is already high, and thus the thin wire will increase it even more and the wire might melt ... if the wire is thick, the resistance will not increase

Answer 2

We would prefer a "Thick wire"  for Low Resistance.

Explanation:

• we can solve this problem by using Ohm's law:-

   consider a 30m long wire with area "A" and radius "r", Now we can apply      

   Ohm's law, we get:-

   $R = \dfrac{\rho l}{A}\\\textrm{where} - R = \textrm{Resistance}\\\rho = \textrm{Resistivity (opposition of flow of electrons)}\\A=\textrm{area of the wire}$

• Now we can see that Resisitivity is constant for wire so that we can write:-

     $R \alpha \dfrac{1}{A}$

    $R \alpha \dfrac{1}{\pi r^2}$

• Here we can see that larger the radius will lead to low  Resistance. As the wire is already a long length, so we will prefer the thick wire to reduce the resistance and as well as reduces the heat effect on wire.

you can learn Ohm's law in details here:

https://brainly.in/question/4153019

you can learn Effect of resistance here:

https://brainly.in/question/7764028