Question

Resistivity of two elements A and B are 1.62 x 10-8Qm and 100 x 10-6Qm respectively
Out of these two, name the element that can be used to make an electric heater.​

Answer 1

Answer:

Element B suits best for an electric heater

Explanation:

We know that H=I²Rt

So, the higher the resistance, the higher the electric current as H∝R

And we also know that R=ρL/A

therefore higher the resistivity, the higher the resistance.

So, the higher the resistivity, the higher the heat produced.

resistivity of A<resistivity of B

So, element B will generate more heat and therefore we should use element B in heaters