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Thermal and electrical conductivity of metals

Thermal and electrical conductivity of metals

Item no.: P2350200

Experiment Type: Teacher Experiment, Laboratory Experiment

Difficulty Expenditure of Time print
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Principle

The thermal conductivity of copper and aluminium is determined in a constant temperature gradient from the calorimetrically measured heat flow. The electrical conductivity of copper and aluminium is determined and the Wiedmann-Franz law is tested.

Benefits

  • Measurement of electrical and thermal conductivity in one set-up
  • Compact, easily transportable setup

Tasks

  1. Determine the heat capacity of the calorimeter in a mixture experiment as a preliminary test. Measure the calefaction of water at a temperature of 0 °C in a calorimeter due to the action of the ambient temperature as a function of time.
  2. To begin with, establish a constant temperature gradient in a metal rod with the use of two heat reservoirs (boiling water and ice water). After removing the pieces of ice, measure the calefaction of the cold water as a function of time and determine the thermal conductivity of the metal rod.
  3. Determine the electrical conductivity of copper and aluminium by recording a current-voltage characteristic line.
  4. Test of the Wiedmann-Franz law.

What you can learn about

  • Electrical conductivity
  • Wiedmann-Franz law
  • Lorenz number
  • Diffusion
  • Temperature gradient
  • Heat transport
  • Specific heat
  • Four-point measurement

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