## EC6202 EDC Notes

Anna University Regulation 2013 EEE EC6202 EDC Notes,  Electronic Devices & Circuits Lecture Handwritten Notes for all 5 units are provided below. Download link for EEE 3rd SEM EC6202 Electronic Devices & Circuits Lecture Handwritten Notes are listed down for students to make perfect utilization and score maximum marks with our study materials.

EC6202-EDC

UNIT-I

1. Define Knee Voltage of a diode

The minimum voltage at which the diode starts conducting and current starts increasing Exponentially is called knee voltage of a diode.

2. What is peak inverse voltage

In reverse biased, opposite polarity voltage appears across diode. The maximum voltage which diode can withstand without breakdown is called peak inverse voltage.

3. Differentiate drift and diffusion current

When a voltage is applied to a material, the free electrons move towards the positive of the battery. While moving them collide with the adjacent atoms and keep changing their directions randomly. In case of diffusion current, the external voltage is not required.

4. What is a PN Junction diode

There are two electrodes each from p-type and n-type materials and due to these two electrodes; the device is called a diode. It conducts only in one direction.

5. Compare series and shunt regulator

Shut regulator

1. The control element is in parallel with the load

2. Only small current passes through  The control element, which is required  to be diverted to keep output constant.

Series regulator

1. The control element is in series with the load

2. The entire load current is always passes through the control element.

6. What are the advantages of bridge rectifier over its centre tapped counterpart?

No centre tap is required in the transformer secondary. Hence, wherever possible a.c Voltage can be directly applied to the bridge. Due to pure alternating current in secondary of transformer, the transformer gets utilized effectively.

7. What is meant by dynamic resistance of diode

The resistance offered by the p-n junction diode under a.c condtions is called dynamic resistance of diode.

8. Differentiate between zener breakdown and avalanche breakdown.

Zener Breakdown

1. The temperature coefficient is negative

2. This occurs for zener diodes with Vz less  Than 6V

Avalanche Breakdown

1. The temperature coefficient is Positive

2. This occurs for zener diodes with Vz greater than 6V

9. Calculate the speed of electron when is falls by a potential of 300 k volts

Speed of electron V = 2Qv m/s

Q = charge on electron = 1.6*10 c

M = mass of electron = 9.107*10 kg

V = 2*1.6*10*30010 = 324.8*10

9.107*10

10. What are the advantage and limitations of LCD Displays

-Less power consumption is the advantage of LCD displays.

-Poor reliability is the limitation of LCD Display.

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EC6202 EDC Notes

Anna University 3rd SEM EEE EDC Lecture Handwritten Notes