.....BRAIN TESTER.....

Let see how well you now about storage devices :) !

1) What does the letters in C.P.U. represent?
a) computers, plants and understand	b) center, play, underline	c) central place underline	d) central processing unit
2) Which of the items below is an example of a storage device?
a) mouse	b) CD (compact disc)	c) printer	d) keyboard
3) The purpose of a flash drive is to ______________.
a) remove information	b) store information	c) deliver information	d) print information
4) A projector, a printer and speakers are examples of _____________.
a) input devices	b) none of the above	c) storage devices	d) output devices
5) A printer is an example of ____________.
a) an input device	b) none of the above	c) a storage device	d) an output device
6) A scanner is an example of an input device because it.___________.
a) removes information from the computer	b) stores information in the computer	c) hides information in the computer	d) adds information to the computer
7) A keyboard is an example of _____________________.
a) an input device	b) none of the above	c) a storage device	d) an output device
8) How many buttons are usually found on a mouse?
a) 0	b) 3	c) 2	d) 1
9) Which of these is considered software?
a) a printer	b) a mouse	c) a scanner	d) Microsoft Office
10) The CPU is also known as the ______________.
a) the legs of a computer	b) the brain of a computer	c) the fingers of a computer	d) the hands of the computer Answers : 1) D 2) B 3) B 4) D 5) D 6) D 7) A 8) C 9) D 10) B

Databas vs Spreadsheet

Do you sometimes get confused between Database and Spreedsheet. For example : What makes them different ? Are there any similaraty between them. Well this powerpoint is a solution to your problems :)

What an interesting way to learn database

To view the video you must click on this link below. Hope it will help you :)

     http://www.bbc.co.uk/schools/gcsebitesize/dida/using_ict/databasesrev9.shtmlk

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Logic Gates

LOGIC GATES.
Logic gates : are very small electronic decision- making hardware devices that are fed one or more inputs and give back one output.
There are three basic logic :
o The NOT gate
o The AND gate
o The OR gate

Thruth table : is used to define the output of a logic gate or a logic circuit for all possible combinations of input.

Boolean expressions
A NOT gate with INPUT X and OUTPUT Z : Z= NOT X ; Z= X
The OR gate with INPUT X & Y and OUTPUT Z : Z= X OR Y ; Z= X +Y
An AND gate with INPUT X & Y and OUTPUT Z : Z = X and Y ; Z= X . Y

NOTE : the combinations relay on the inputs eg. 2 inputs -> 4 combinations

Building the truth table for logic circuit
First, you need to ask these two questions :
o How many inputs does the circuit have?
o Hence how many input combinations of the circuit are ?.

example :

A                      B	C	D
0                      0	1	0
0                      1	1	1
1                      0	0	0
1                      1	0	0