In this experiment, students simultaneously measure both current and voltage for a simple DC circuit. The relationship between current and voltage is explored for a 10 ohm resistor, 33 ohm resistor, and a light bulb.

Prior to performing the Ohm's Law experiment, students study the characteristics of a capacitor by recording current and voltage measurements during both the charging and discharging cycles. Once the function of a capacitor is better understood, the capacitor is used as a variable voltage source during the Ohm's Law experiment.

The relationship between current and voltage is studied for each resistor and the light bulb to determine their similarities and differences.

PASCO Advantage:
Using a capacitor as a variable voltage source allows the experiment to be easily repeated for several loads. Students can view the voltage vs. current graph real-time which allows them to see the relationship unfold before their eyes. Furthermore, the tangent tool on the DataStudio graph enables students to easily determine resistance of the light bulb at any instant.

The included AA batteries charge the capacitor, and thus no other power supply is needed.