Electrical resistivities of some substances at $20 °\mathrm{C}$ are given below:

Silver : $1.60\times {10}^{-8} \mathrm{\Omega } \mathrm{m}$

Copper : $1.62\times {10}^{-8} \mathrm{\Omega } \mathrm{m}$

Tungsten : $5.20\times {10}^{-8} \mathrm{\Omega } \mathrm{m}$

Iron : $10.0\times {10}^{-8} \mathrm{\Omega } \mathrm{m}$

Mercury : $94.0\times {10}^{-8} \mathrm{\Omega } \mathrm{m}$

Nichrome : $10.0\times {10}^{-6} \mathrm{\Omega } \mathrm{m}$

Answer the following question in relation to them:

Which material would you advise to be used in electrical heating devices? Why?