Principle

The resistances of various DC conductors are determined by recording the current / voltage characteristic. The resistivity of metal rods and the contact resistance of connecting cords are calculated.

Benefits


Measurement at two different metals possible

Conductivity rods can be used both for electrical and thermal conductivity experiments

Measurement amplifier can be used for both AC and DC measurements and amplifies up to 10,000 times


Tasks


To plot the current / voltage characteristics of metal rods (copper and aluminium) and to calculate their resistivity.

To determine the resistance of various connecting cords by plotting their current / voltage characteristics and calculating the contact resistances.


What you can learn about


Ohm’s law

Resistivity

Contact resistance

Conductivity

Four-wire method of measurement