Metals are generally excellent conductors of heat and electricity. Because of this, we tend to neglect any resistance in wires when we examine the behavior of ordinary loads (bulbs, resistors, motors, etc.) in electrical circuits. But metals are not perfect conductors, otherwise the wires in our toasters would not get hot. In this experiment, you will examine the factors that affect the electrical resistance of metals.


In this experiment, you will

  • Collect potential difference and current data for a number of metal rods.
  • Determine the electrical resistance for each of the readings.
  • Determine how length, cross-sectional area, and type of material affect the resistance of a metal rod.