`I = σEA where:`

I is the current flowing in the conductor (in amperes)

σ is the conductivity of the material (in siemens per meter)

E is the electric field strength (in volts per meter)

A is the cross-sectional area of the conductor (in square meters)

This equation is known as Ohm’s law, which states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points.

Here is a list of different materials and their conductivity:

Silver: 63 x 10^6 S/m

Copper: 59 x 10^6 S/m

Gold: 45 x 10^6 S/m

Aluminum: 37 x 10^6 S/m

Calcium: 29 x 10^6 S/m

Tungsten: 18 x 10^6 S/m

Nickel: 14 x 10^6 S/m

Brass: 15 x 10^6 S/m

Iron: 11 x 10^6 S/m

Platinum: 9.4 x 10^6 S/m

Zinc: 16.7 x 10^6 S/m

Tin: 9.2 x 10^6 S/m

Lead: 4.8 x 10^6 S/m

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