1. Computer Logic Distinction between analogue and discrete processes and quantities. Conversion of analogue quantities to digital form. Using sampling techniques. Storage units.

2. Digital Data Digital data is represented by 1s and 0s 1 represents that the switch is on 0 represents that the switch is off Digital data (1s and 0s) is known as binary. A computer system only understands digital data

3. Analogue Data Analogue data is represented by analogue signals An example of analogue data are sound waves from our voice Analogue data must be converted to digital data for the computer to understand it.

4. Analogue to Digital Data ATD As we said before analogue signals need to be changed to digital data to be understood by our computer. ATD devices convert analogue signals to digital data

5. Digital Data to Analogue Signals DTA For us to understand computer language the digital data needs to be converted to analogue data DTA devices convert digital data to analogue signals, ex: modem Dear John,Is it OK if we meet at 6? 1001 0010 IS P 1001 0101 Dear John, Is it OK if we meet at 6?

6. Comparing Analogue to Digital devices Analogue deviceDigital device Continuous signal Varying values Values not rounded up Difficult for precise reading Not a continuous signal Values rounded up Easy and clear to read Becoming more precise

7. Analogue and Digital Graphs Analogue graph Digital graph Changing an Analogue graph to a Digital graph is called Sampling

8. Units of Storage A computer has many different units of storage The storage units we will be going through today are;  Bits  Bytes  Kilobytes  Megabytes  Gigabytes  Terabyte s Each storage unit is made up of a number of bits

9. Bit A bit is the smallest unit of storage within a computer A bit can only store a 1 or a 0 A bit is too small to store anything, hence they are joined to create other larger storage units. 1 Bit

10. Byte A byte is made up of 8 bits One character is made up of 8 bits, hence 1 byte can hold 1 character. To store the word byte you would need 4 bytes 1 Byte8 Bits

11. Kilobytes Bytes are still very small to store many files so a larger storage unit is used, a Kilobyte 1024 bytes are grouped together to create a kilobyte 1 KiloByte 1024 Bytes

12. Units of Storage UnitEquivalent Bit(Can only store 0 or 1) Byte8 Bits Kilobyte (KB)1024 Bytes Megabyte (MB)1024 Kilobytes Gigabyte (GB)1024 Megabytes Terabyte (TB)1024 Gigabytes

13. Converting Units of Storage In order to convert small units to large ones we need to divide If we want to convert 7680 Bytes into KB (smaller to bigger unit); 1 KB = 1024 Bytes ? KB = 7680 Bytes 7680/1024=7.5KB

14. Converting Units of Storage In order to convert large units to smaller ones we need to multiply If we want to convert 3MB into KB (bigger to smaller unit) 1 MB = 1024 KB 3 MB = ? KB 3 x 1024 = 3072 KB

15. More examples to work out Convert 4MB into kB Convert 5890 Bytes into KB Convert 2GB into KB (round up your answers when needed. eg; 4.6 becomes 4)

16. Answers Convert 4MB into kB MB = 1024 KB 4MB = ? KB 4 x 1024 = 4096MB

17. Answers Convert 5890 Bytes into KB 1024 bytes = 1 KB 5890 bytes = ? KB 5890/1024 = 6KB

18. Answers Convert 2GB into KB 1 GB = 1024 MB 2 GB = ? MB 1 MB = 1024 KB 2048MB = ? KB If I want to know how many bytes there are in 2GB what would my next step be? 2 x 1024 = 2048MB 2048 x 1024 = 2097152KB

19. Some typical storage devices DeviceStorage Other Possibilities Floppy Disk1.44MB CD700MB DVD4.7GB8.7GB, 9.4GB Pen Drive8GB 2GB, 4GB, 16GB, 32GB Blu Ray25GB50GB, 100GB Hard Disk500GB1TB

20. Home – Work Handout 02 (form3opt1.blogspot.com)