Aim:To study the charecteristics and verification of stability action of Zener diode

 Aim : To study the charecteristics and verification of stability action of Zener diode 

Apperatus : Zener diode, DC Battery , voltmeter

Miliammeter etc.

Formula : Static Resistance = V/I

                   Dynamic Resistance = ∆V/ ∆I

Diagram : 

Procedure : 1) Make the connection as shown in circkt diagram. Here the Zener diode is connected in reverse biased mode.

2) Start increasing the voltage by 0.1V steps.

3) Note down the value of voltage where you first find the current in millimetre.

4) Go on increasing the value of Voltage from voltmeter. Note down the corresponding values of current. Note down the voltage at which current suddenly increases.

5) Draw a graph of Voltage Vs Current in third quadrant because the zener diode is connected in reverse biased mode.

6) Calculate the value of Resistance from the formula.

7) Interprete your Result with SI unit.

8) Write the conclusion from the observed 

Results :

1) The Breakdown Voltage for Zener diode is......V

 2) The calculated value of Static Resistance is.....ohm

 3) The calculated value of Dynamic resistance is...ohm

To study the charecteristics of Silicon and Germanium diode and their comparison

Aim : To study the charecteristics of Silicon and Germanium diode  and their comparison

Apperatus : pn junction diode of silicon and germanium.

Formula : Static Resistance = V/I

                   Dynamic Resistance = ∆V/ ∆I

Diagram : 

Procedure : 1) Make the connection as shown in circkt diagram.

2) Start increasing the voltage by 0.1V steps.

3) Note down the value of voltage where you first find the current in millimetre.

4) Go on increasing the value of Voltage from voltmeter. Note down the corresponding values of current.

5) Draw a graph of Voltage Vs Current.

6) Calculate the value of Resistance from the formula.

7) Interprete your Result with SI unit.

8) Repeat the above steps 1) to 7) for second diode

9) Compare their Results and note that which diode is more conducive. Write the conclusion from the observed Results.

Result :

1) The Cut-in Voltage for Germanium and Silicon diodes are....... and.......

 2) The calculated value of Static Resistance is.....

 3) The calculated value of Dynamic resistance is....