The fundamental relationship among the three important electrical quantities current, potential difference (voltage), and resistance was discovered by Georg Simon Ohm. The relationship and the unit of electrical resistance were both named for him to commemorate this contribution to physics. One statement of Ohm’s law is that the current through a resistor is proportional to the potential difference, in volts, across the resistor. In this experiment, you will see if Ohm’s law is applicable to several different circuits using current and voltage probes.


  • Determine the mathematical relationship between current, potential difference, and resistance in a simple circuit.
  • Compare the potential vs. current behavior of a resistor to that of a light bulb.