Скачать или смотреть 7. ZENER DIODE NUMERICALS | PROBLEM 8 AND 9 | BASIC ELECTRONICS | SECRETS OF PHYSICS | RABIA BABER

. In the given circuit, The ZENER DIODE has a breakdown voltage of 6Volts. If the knee current is 5mA. Calculate the minimum value of resistance so that the voltage across Zener Diode remains constant at 6Volts.
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A Zener diode is a special type of diode designed to work reliably in reverse bias (the opposite direction of a normal diode) and maintain a nearly constant voltage across it. Because of this ability, Zener diodes are widely used in voltage regulation, over-voltage protection, and as reference voltage sources in electronic circuits.
1) What is a Zener Diode?
A Zener diode is a heavily doped PN junction diode. In normal diodes, reverse bias is avoided because a large reverse voltage can damage the diode. But a Zener diode is made to operate safely in reverse breakdown at a specific voltage called the Zener voltage (Vz).
In forward bias, a Zener diode behaves like a normal silicon diode (it drops about 0.7 V approximately). Its special feature appears in reverse bias, where it allows current to flow once the reverse voltage reaches Vz, while keeping the voltage nearly constant.
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Conclusion
A Zener diode is a very useful electronic component known for its ability to maintain a constant reverse voltage. It works in reverse breakdown and is widely used in voltage regulation and protection circuits. Understanding its V-I characteristics, breakdown mechanisms, and key parameters (Vz, Iz, Pz) helps you design safe and effective circuits. Zener diodes are especially important in basic electronics because they show how a simple component can control voltage and protect circuits from damage.
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