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mmmboh
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Hi I have been looking through my book, and even online for the answer because I don't understand why this happens, but I can't find the proper answer anywhere...can someone help me? Thanks.
mmmboh said:Hi I have been looking through my book, and even online for the answer because I don't understand why this happens, but I can't find the proper answer anywhere...can someone help me? Thanks.
Bob S said:For a common diode rectifier such as the 35Z5 used in transformerless AM radios, electrons flow to the plate (pin 5) from the cathode (pin 8) when the cathode is negative relative to the plate, and stop flowing when the cathode is positive relative to the plate. The cathode is indirectly heated by the filament and is very hot, and is a good source of electrons. The plate is not.
When a diode is forward biased, it allows current to flow through it in one direction. This is because the p-n junction in the diode is in a conductive state. However, when the diode is reverse biased, the p-n junction becomes non-conductive, preventing any current flow. Therefore, the current and voltage are zero in this direction.
In forward bias, the diode acts as a closed switch, allowing current to flow through it. This is because the p-n junction is in a conductive state, allowing electrons to easily cross the junction. In reverse bias, the diode acts as an open switch, preventing any current flow. This is because the p-n junction becomes non-conductive, making it difficult for electrons to cross the junction.
Yes, a diode can be damaged by reverse bias if the voltage applied in the reverse direction exceeds its breakdown voltage. This can cause a breakdown in the p-n junction, permanently damaging the diode. Therefore, it is important to use diodes within their specified voltage limits in both forward and reverse bias.
A diode is commonly used in electronic circuits because it allows current to flow in only one direction. This is useful for rectifying alternating current into direct current, which is required for many electronic devices to function. Diodes also have other applications such as voltage regulation and signal modulation.
No, diodes can vary in their characteristics and applications. Some of the most commonly used diodes include the p-n junction diode, Zener diode, Schottky diode, and light-emitting diode (LED). Each type of diode has unique properties and uses, making them suitable for different electronic applications.