CBSE class 12th Physics-Diode

In this article you will get the clue that from where and how the questions are being framed from the topic Diode
The experts of jagranjosh.com have full confidence that you will not miss any of the questions in the board exam as well as in competitive exams from this chapter if you will keep the following terms / question in your mind while studying.

Created On: Dec 14, 2012 14:36 IST
Modified On: Apr 5, 2013 17:33 IST

In this article you will get the clue that from where and how the questions are being framed from the topic Diode
The experts of jagranjosh.com have full confidence that you will not miss any of the questions in the board exam as well as in competitive exams from this chapter if you will keep the following terms / question in your mind while studying.

Diode works as

  • Rectifier
  • Modulator
  • Detector

Metals have hedge number of free electrons

Methods to take out the electrons are

Field emission

Photoelectric effects

Secondary emission

Thermionic emission (addition effect)

On which method diode and triode works

Differences among all the methods

Is diode and triode means vacuum tube?

Space charge /electron cloud

Role of Space charge

Saturated current

Relation between saturation current and temperature

Richardson-Dushman equation

Graph between saturation current density and temperature

Formula for saturation current density

Richardson equation

Cut of potential

Relation between plate current and plate potential in ohmic range and non ohmic range

If plate potential and plate current is zero, then what about space charge

What is dynamic and static resistance?

Relation between dynamic and static resistance

Detailed study of the all three region of the graph (working of diode)

In which region the resistance of the diode is minimum?

What is rectification?

Diode as half and full wave rectifier (diagrammatic representation)

  • How undesired current is produce
  • Reason for the fluctuation of out put
  • Ripple factor
  • Ripple frequency
  • Average value of DC components
  • RMS value of AC current
  • RMS value of total out put
  • Current developed in secondary circuit
  • Peak current
  • Rectifier efficiency
  • The maximum value of rectifier efficiency practically as well theoretically
  • Why half wave rectifier is a bad rectifier?
  • Diode as half wave rectifier (diagrammatic representation)

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