Manga Part 4 156-195

1.    What is an example of a semiconductor device?

 Transistors, Diodes

2.    Why is silicon used in the manufacture of semiconductors?

It used as a raw material and it is refined product.  The refined of this material is almost 100% … 99.999999999% 9x11 . It causes to increase the electrical conductivity of semiconductor.

3. Discuss the difference using an example of the difference between and N-type and P-type semiconductor.

The electrode of P-type in semiconductor is Anode, which is included negative property, and N-Type is called Cathode, which is included positive property.

4.In your own word describe what a diode does and the role of N and P type semiconductors.

N-Type of semiconductor goes to hole of P- type of semiconductor; this    connection becomes a wall that prevents the electrons’ moving. When the holes of P-type and free electrons’ of the N-type of semiconductor are attracted to each other, cause to enhance of the potential barrier and current will flow.

5.What is rectification?

It is kind of property that allows current to flow in one direction.

6.    What causes color in an LED? Give and example of what causes a particular color.

The color of LED depends on raw materials of semiconductor, which emits wavelength of the light. Such as light in traffic signals, mobile phone digital camera. Luminescence of light emitting in diodes doesn’t import heat and it works with efficient energy that why there are variety and used in different ways.

7.What is the relationship between base current and collector current in a transistor?

Base current is when the current that flows from the base to the emitter and base current also current from the collector to the emitter is called collector current.  When the base current flows, the collector current will also flow.

7.    What are the advantages of a transistor over a switch?

Transistor can be used in replace of contactless switch, and it is not similar to switch to have a physical contact. Transistor it doesn’t wear out is less to fail has more control while in turn on and turn off rapidly.