Activity 1 .

1.-Explain what is meant by the term bitmap format.And give two examples of bitmap format file types.

Bitmap is a type of graphic composed of pixels in a grid.Each pixel or "bit" contains color information for the image.Some common bitmap formats are GIF and JPG.

3.- Name some disadvantages of using bitmap format graphics.

Bitmaps have two disadvantages. In terms of the amount of digital storage, bitmaps are memory intensive, and the higher the resolution, the larger the file size. The other disadvantage with bitmaps is when an image is enlarged, the individual coloured squares become visible and the illusion of a smooth image is lost to the viewer. This 'pixelation' makes the image look coarse.

5 .- Give some advantages and disadvantages of using vector format graphics.

Advantage:

-Each vector objet is scalable and can generally be resized without any loss of memory.

Disadvantage:

-Vector images though they are highly defined, are not appropiate for use in producing realistic-looking photos and images. Vector images have solid color and they are not conducive to sequences of subtle color tone and shade.

ENGLISH AND COMPUTER

Unit 1 - COMPUTERS AND THE PASSIVE VOICE

- When the computer is switched off, the contents of ROM are not lost.
- The main use of ROM memory in a computer is to store a program that runs when the computer is turned on.
- The contents of RAM can be changed because it only stores programs temporarily.
- Binary numbers are used by computers because they are very simple to make electronic circuits for.
- A binary number is represented by a pattern of 0 and 1.
- A single unit in binary is called a bit.
- Computer memory is measured is bytes.
- One byte is needed for each letter.

RAM and ROM

RAM and ROM are both types of memory used by personal computers.

1.- Which one of these types of memory is volatile?
2.- Explain the difference between volatile and non-volatile memory.
3. - Why does a personal computer need both of these types of memory?

COMPUTERS - Bits and bytes

Watch the video and answer the questions bellow:

1. How many bits are in one byte?
2. How many bytes are needed to store one character of text data?
3. How many bytes are needed to store the sentence shown below:

The quick brown fox jumps over the lazy dog

4. - Which is the largest number (decimal) you can represent with a byte?

5.- Sort the computer memory sizes listed below into increasing order of size with the smallest first and the biggest last:

10MB 100KB 5GB 50 MB 500KB

PLASTICS

Plastics are versatile and flexible materials .
All plastics are based on polymers and they are created by bonding molecules together.
The terms monomer and polymer are very important in the plastics industry. A monomer is a relatively small molecule that can chemically bond to other monomers, forming a polymer. Remember, all plastics are polymers.

There are different types of plastic:

Thermosettings plastics
Once 'set' these plastics cannot be reheated to soften, shape and mould. The bond between the molecules is very strong.

Thermoplastics
These plastics can be re-heated and therefore shaped in various ways. They become mouldable after reheating. Reheating and shaping can be repeated. The bond between the molecules is weak These types of plastics can be recycled.


1.- Read the text, looking for the meaning of those words you do not understand.
2.- Write down this vocabulary in your notebook