Resistivity Apparatus - EM-8812



A current is established in a wire of known diameter, and the voltage drop across a section of the wire is measured. Students can calculate the resistance of the wire and the resistivity of the material.


  • Vary wire length: Slide-wire potentiometer pick-up makes it easy. Use the built-in scale to measure the length of the wire.
  • Vary wire diameter: Four different diameters of brass wire are included. Investigate the difference between resistance and resistivity. Interchange wires quickly and easily.
  • Vary wire material: Five different material wires are included. Investigate how resistivity depends on the wire material.
  • Storage: Built-in storage tray to hold wires.
  • Sample Wire -- Wires are held securely and straight by the wire guides and lugs.
  • Slide Wire Probe -- Spring-loaded wire probe slides easily along the wire, making contact at a single point.
  • Built-in cm Scale and slide wire probe make it easy to measure the voltage drop across various wire lengths.


Includes two each of the following (30 cm long) wires:

  • Copper (1.0 mm diameter)
  • Aluminum (1.0 mm diameter)
  • Stainless Steel (1.0 mm diameter)
  • Nichrome (1.0 mm diameter)
  • Brass (0.5 mm, 0.8 mm, 1.0 mm, 1.3 mm diameter)
  • Buying Guide