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An LED is a light-emitting diode. Lighting an LED is considered the "Hello world" of a circuit design, and it can be as simple as using a series resistor, or it can get more complicated, involving PWM and multiplexing.

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Calculating forward voltage for a string of fairy lights: multimeter shows "1"

They all appear to run in parallel, connected horizontally along two wires until the last led. … I tried isolating a single led to calculate the forward voltage drop, but my multimeter shows "1" with the diode test, and successfully lights up the LED. …
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