Question

observe the fallowing table which of the meterial can be used for transmisdion of electricity heating material and insulator and why?
Meterial Resistivity(homs m)
A 1.62×10^-8
B 100×10^-6
C 1×10^10​

Answer 1

Answer:

For making the element of a heating device, we use an alloy as : <br> (i) its resistivity changes less rapidly with changes in temperature and <br> (ii) it does not oxidise (burn) readily at high temperature. The resistivities of materials

lie in the range of resistivity of alloys. (In fact, material

is nichrome and material

is manganin. We use nichrome for making an element of a heating device).