Calculate the number of electrons constituting one coulomb of charge.

Substances

Material

Resistivity (Ω m)

Conductors

Silver

$1.60 \times {10}^{–8}$

$1.62\times {10}^{–8}$

Aluminium

$2.63 \times {10}^{–8}$

Tungsten

$5.20 \times {10}^{–8}$

Nickel

$6.84 \times {10}^{–8}$

Iron

$10.0 \times {10}^{–8}$

Chromium

$12.9 \times {10}^{–8}$

Mercury

$94.0 \times {10}^{–8}$

Manganese

$1.84 \times {10}^{–6}$

Alloys

Constantan (alloy of $\mathrm{Cu}$ and $\mathrm{Ni}$)

$49 \times {10}^{–6}$

Manganin(alloy of $\mathrm{Cu}, \mathrm{Mn}$ and $\mathrm{Ni}$ )

$44 \times {10}^{–6}$

Nichrome (alloy of $\mathrm{Ni}, \mathrm{Cr}, \mathrm{Mn}$ and $\mathrm{Fe}$)

$100 \times {10}^{–6}$

Insulators

Glass

${10}^{10} – {10}^{14}$

Hard rubber

${10}^{13} – {10}^{16}$

Ebonite

${10}^{15} – {10}^{17}$

Diamond

${10}^{12} – {10}^{13}$

Paper (dry)

${10}^{12}$