5J20.20 - Series vs Parallel (AC Circuit) - Different Bulbs


The finished product, demonstrating the bulbs in series.
The finished product, demonstrating the bulbs in series.



Code: 5J20.20


Demo Title: Series vs Parallel (AC Circuit) - Different Bulbs


Subject: LR Circuits


Description:
Two simple circuits employing three lightbulbs of different wattages in series and in parallel further exemplify the differences between parallel and series circuits.


Procedure:

  • First, have the wattages for all of the lightbulbs be the same (75W)
  • Then ask the students to make predictions for how the brightness of the bulbs change depending on whether they are in series or parallel as the bulbs are turned on.
  • Next, replace the bulbs with different wattages for the series and parallel circuit respectively. (40W, 75W, and 100W)
  • Once again, ask for the predictions for what bulb will be the brightest as they are turned on in sequence for both the parallel and series circuits.
  • Lastly, discuss why the bulbs behave in the manner they do for the parallel and series circuits respectively.


Video URL:


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