PHYWE 4-point method / Measuring small resistances / Ohm's law

Principle The resistance of various DC conductors is determined by recording the current-voltage characteristics. The specific resistance of the metal rods and the contact resistance of the connecting cords are calculated. Advantages Possibility of measuring on two different metals The conductivity conductors can be used for both electrical conductivity and thermal conductivity experiments The measuring amplifier can be used for both AC and DC measurements and amplifies the signal up to 10,000 times Objectives Plot the current-voltage characteristics of metal rods (copper and aluminum) and calculate their specific resistance. Determine the resistance of various connecting cords by plotting their current-voltage characteristics and calculating the contact resistances. Learning Objectives Ohm's Law Specific Resistance Contact Resistance Conductivity Four-wire Method