Advertisements
Advertisements
प्रश्न
Explain, with the help of a circuit diagram, the principle and working of a Zener diode as voltage regular.
Explain the working of Zener diode as a voltage regulator.
Advertisements
उत्तर
Principle: A properly doped p–n junction that is supposed to work in a breakdown region is called a Zener diode. Such a junction when reverse biased shows a sudden increase in current to a high value at a certain voltage known as the breakdown voltage or the Zener voltage.
Working: A Zener diode can be used as a voltage regulator to provide a constant value of voltage from a source whose value fluctuates over a wide range.
Given below is a circuit diagram. The fluctuating voltage source connects to a Zener diode through a resistance R. Across the load resistance RL, a steady voltage supply is kept.
When the input voltage increases, the resistance of the Zener diode decreases, and hence the current through the diode increases. Thus, a large voltage drop is seen across the resistance R and the output voltage across RL remains at a constant value. When the input voltage decreases, the resistance of the Zener diode increases and hence the current through the diode decreases. Only a small voltage drop takes place now across the resistance R, and the output voltage at RL remains constant. Thus, we get a constant voltage in spite of the fluctuating input voltage. In this way, a Zener diode acts as a voltage regulator.
Notes
Students should refer to the answer according to their question and preferred marks.
APPEARS IN
संबंधित प्रश्न
Describe, with the help of a circuit diagram, the working of Zener diode as a voltage regulator.
What is Zener diode?
Draw the circuit diagram of zener diode as a voltage regulator and briefly explains its working ?
Name the device which is used as a voltage regulator. Draw the necessary circuit diagram and explain its working?
Describe briefly with the help of a circuit diagram how a zener diode works to obtain a constant dc voltage from the unregulated dc output of a rectifier ?
Voltage applied between cathode and anode of an X-ray tube is 18 kV. Calculate the minimum wavelength of the X-rays produced.
Draw labelled graphs showing the input and output voltages.
In the circuit shown in the figure, the potential barrier for Ge diode is 0.3 V and for Si diode it is 0.7 V. What is the voltage VA?
Electronic motors operating at low voltages tend to burn out because
For a chosen non-zero value of voltage, there can be more than one values of current in
Consider the following statements (A) and (B) and identify the correct answer.
(A) A Zener diode is connected in reverse bias when used as a voltage regulator.
(B) The potential barrier of the p-n junction lies between 0.1 V to 0.3 V.
Consider the following statements (A) and (B) and identify the correct answer.
- A zener diode is connected in reverse bias, when used as a voltage regulator.
- The potential barrier of p-n junction lies between 0.1 V to 0.3 V.
For the circuit shown below, calculate the value of Iz ______.
In connection with the circuit drawn below, the value of current flowing through 2 kΩ resistor is ______ × 10-4 A.
The reverse breakdown voltage of a Zener diode is 5.6 V in the given circuit.
The current Iz through the Zener is ______.
A Zener diode is to be used as a voltage regulator. Identify the correct setup.
