Do diodes need a resistor?
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The characteristics of a standard diode
Let us first look at the diode without the resistor in series. ... The voltage VD drops across the diode and the current ID flows through the diode. It is not recommended to operate a diode in this way. Diodes should always be combined with a series resistor.
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An LED (Light Emitting Diode) emits light when an electric current passes through it. ... If the voltage source is equal to the voltage drop of the LED, no resistor is required. LEDs are also available in an integrated package with the correct resistor for LED operation.
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