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The equation for calculating current flowing in a conductor from an electric field


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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