This demonstration will show the relationship of series resistors or parallel resistors to current/voltage. This device can be easily wired as a parallel or series circuit. By completing the circuit you can compare the brightness of the bulbs to the amount of current/voltage in the circuit and relate that to the overall resistance in either circuit.

Directions for doing the demo: Place the device under the document camera and press the button. Relate to the class how current, resistance and voltage behave for a parallel circuit. Let go of the button and rewire the circuit in series. Press the button and relate to the class how current, resistance and voltage behave for a series circuit. Be sure to contrast for the class the brightness of the light bulbs and emphasize why the difference for each type of circuit.

Applications: Ohm's Law, Series Circuits, Parallel Circuits