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LED-Driver-Slide2

A light emitting diode is a semiconductor light source. When a light emitting diode is forward biased (switched on), electrons are able to recombine with electron holes within the device, releasing energy in the form of photons. The light intensity is determined by the amount of current passing through the LED. The graph presented on this page shows the relationship between the forward voltage and current in a LED. The page also shows a simple circuit that can be used to drive LEDs by applying a voltage and adjusting a resistor to get the required amount of current. 

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