An L.E.D., or light emitting diode, is a semiconductor device that emits light when an electric current is passed through it. As a diode, it allows current to flow in one direction while blocking it in the opposite direction due to its unique material composition and design.
By connecting an L.E.D. in series with other components, such as resistors, in a circuit, the forward voltage drop of the L.E.D. can be used to regulate the amount of current flowing through the circuit. This is known as using the L.E.D. as a diode to control current flow.
One advantage is that L.E.D.s have a lower forward voltage drop compared to traditional diodes, which means they can be used to regulate current flow with less energy loss. L.E.D.s also have a longer lifespan and are more durable than traditional diodes.
One limitation is that L.E.D.s have a maximum forward voltage and current rating, so they may not be suitable for high voltage or high current applications. Additionally, L.E.D.s may be more sensitive to temperature changes and can fail if not properly heat-sinked.
Yes, L.E.D.s can be used as diodes in both AC and DC circuits. However, in AC circuits, they will only allow current to flow in one direction during each half cycle of the alternating current.