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An LED, a light emitting diode, is a light source often used as an indicator.
3
votes
Why do LED lights need resistors?
A LED only needs between 1.6 V and 3.6V. If you supply a higher voltage the current would increase more than it is good for the LED. … current allowed for the LED (which could damage the LED)
For a more in-depth background look at https://www.electronics-tutorials.ws/diode/diode_8.html …