PIRA 5L30.20 Filters and Rectifiers: Blinky Whirlygig
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Photo of University of Texas at Austin's Demonstration
Instructions / Notes:
- A dual light emiting diode is connected to either a DC or an AC power source.
- The DC power source needs to be connected twice so that the class can see the effect of reversing the current.
- The dual LED changes color when the current is reversed.
- The dual LED is on a long lamp cord so it can be whirled when connected to an AC power source.
- When connected to an AC power source both LED's light up, but not simultaneously.>
- By whirling the LED cord with the room lights dimmed, students see a red to green strobe effect.>
Photo show's student whirling the LED cord at University of Texas at Austin.
Last Updated 3/99 - University of Texas at Austin Physics Department - All Rights Reserved