In this experiment, Diodes made of Gallium Arsenide are used or more commonly called LEDs. A turn-on voltage of about 1.5V is needed to pass current through these LEDs, but this voltage can vary depending on the type of LED. This current is so high that light is generated as it passes through the LED. In the video demonstration, the red LED lights up and slowly dims as the 100 microfarad capacitor is charged up. The second, blue LED does not light because it is wired in reverse-biased. Then the second wire (ground) is used to light the blue LED, which dims as the capacitor is discharged. The red LED does not light because it is wired in reverse-biased and not passing current.
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