The resistance of the light-emitting diodes (leds), do you know how?
light emitting diode or leds, is composed of materials such as gallium, arsenic, phosphorus and nitrogen of semiconductor components, it has the characteristics of unidirectional conduction, after electrify can converts electrical energy into light energy. How, then, the resistance of the light emitting diode, you know?
actually photodiode the resistance of the forward and reverse two conditions.
forward resistance: the luminous diode forward when the applied voltage, the flow direction of current flow is positive, then it would be about 200 k Ω resistance tolerance. When positive measure voltage, measure the voltage of electric field is greater than, the electric field for the silicon tube, commonly used voltage higher than 0. 7 v, will measure the resistance of relatively small.
reverse resistance: the luminous diode reverse when the applied voltage, the direction of current flow is reversed flow, because it is the same as ordinary diode is composed of a PN, has the characteristics of unidirectional conduction, so it will be infinite resistance. When reverse measure voltage, measure the voltage as 'electric field direction of electric field, which strengthened the electric field, which hindered the flow of electrons, measure the resistance of the will is larger.
so, light emitting diode forward resistance is probably a few Ω to 200 k, while the reverse resistance is infinite.
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