Distinction between insulator, conductor and Semiconductor

 1.   Insulator: Through these materials electricity cannot pass is called insulators. Plastic, glass, wood etc are the examples of insulators. The valence band of those material remains full of electrons. The conduction band of those material remains empty. The forbidden ...

Light emitting diode

What is Light emitting diode: Light emitting diode is a diode through which light emits. Popular name of light emitting diode is LED. It is short form of full name. When current flows through the LED, it becomes illuminated.  By ...

What is rectifier?

We use sinusoidal a.c. voltage in our house. A.C sinusoidal voltage changes its polarity continuously. Many electronic appliances we use in d.c voltage in our house like audio, amplifier, radio, tape, recorder etc. To operate those D.C. electronic appliance we ...

Reverse bias

 When a p-n junction p-region is connected negative terminal of a battery or a potential difference and n-region is connected with positive terminal of the battery this method of connection is called reverse bias. A circuit diagram is shown in ...

Forward bias

Definition of forward biasing When a battery or a potential difference is used to the p-region of p-n junction for making p-region positive then this supplying method is called forward bias. The positive terminal of the battery is connected with ...

What is a Zener diode?

Zener diode is an important diode. It is used extensively electronic device. Many of electronic circuit require D.C. voltage to operate. But it is not always possible normally. The voltage can be stable if Zener diode is used. It gives ...

p-n junction diode

When an n type semiconductor is joined to a p type semiconductor such that the crystal structure remains continuous at the boundary, the junction is called the p-n junction and the resulting combination is called a p-n junction diode or ...

What is n-type semiconductor?

A pentavalent impurity like arsenic, phosphorous is added with pure semiconductor like silicon or germanium for making n type semiconductor. The most important requirement is that the size of the impurity atom should be nearly equal to the size of ...