Electrical conductivity

CB-IN-91/EV

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The purpose of the exercise is to carry out comparative tests of electrical conductivity between various substances: metals, non-metals, liquids, crystalline ionic substances, in solution and in a molten state. An electrical circuit is prepared consisting of a 6 volt D.C. power supply connected to a suitable bulb. We conclude that by inserting a conductor in the circuit the bulb lights up, while in the case of an insulator the light bulb does not light up.

Training program

  • First part: conductivity tests of some metals and non-metals (zinc, copper, sulphur, paraffin and graphite)
  • Second part: conductivity tests of some liquids (water, ethyl alcohol and benzene)
  • Third part: conductivity tests of pure substances (potassium iodide, sucrose, glacial acetic acid, crystalline sodium hydroxide) dissolved in water
  • Fourth part: conductivity of melted substances
  • Fifth part: influence of concentration in the conductivity of a solution
    • A salt solution (copper sulphate)
    • A strong acid solution (hydrochloric acid)
    • Comparison between 0.5 M solutions of hydrochloric acid and acetic acid

Technical specifications
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