What Is Meant By Knee Voltage
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You can only measure this when current is flowing through the diode. ... The current passing through resistor and diode is the same. The total voltage drop across the resistor and diode will be the same. The LIGHT EMITTING DIODE has a much larger voltage drop (about 1.5V - 3.0 V) than a 'normal' diode.
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At room temperature, a potential difference equal to the barrier potential is required before a reasonable forward current starts flowing across the diode. This voltage is known as threshold voltage or cut-in voltage or knee voltage.
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