1. Skills: none Concepts: the quantity of data as measured in bits or bytes, prefixes for large numbers, abbreviation conventions, data ≠ information This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License. Data quantity – how much data?

2. Where does this topic fit? Internet concepts – Applications – Technology – Implications Internet skills – Application development – Content creation – User skills

3. 010101011100101010101010101010111010 101010101010101010101010100101010101 000010110101010101010010101101101010 101010110010110010101010100101110101 001010010101010101010001001010101011 010011010010101010100101101001011100 101010101001010101000101010101010101 010010101001010101001001001001010101 001000101010101110100101001010101010 010101010101001010100100101010010101 001001010101001010100101010100101010 101001010101011110101011100001111011 All data is binary

4. 0 1 The bit – the smallest amount of data

5. One bit can contain information 1 → Male 0 → Female

6. PrefixMeans Exact value kilo1024^11,024 mega1024^21,048,576 giga1024^31,073,741,824 tera1024^41,099,511,627,776 PrefixMeans Close enoughDecimal name kilo1000^11,000thousand mega1000^21,000,000million giga1000^31,000,000,000billion tera1000^41,000,000,000,000trillion Numeric prefixes – exact and close enough

7. Decimal numbers, 10 symbols: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 Binary numbers, 2 symbols: 0, 1 Why 1,024?

8. Binary 0 1 10 100 1000 10000 100000 1000000 10000000 100000000 1000000000 10000000000 1111101000 Decimal 0 1 2 4 8 16 32 64 128 256 512 1,024 1,000 Round number Funky number

9. A byte is 8 bits 10010101

10. Abbreviations PrefixBitsBytes KKbKB MMbMB GGbGB TTbTB

11. Without a calculator … How many bits in 1,400 bytes? Which is more – 1 megabit or 100 KB?

12. Memory and storage capacity What is the capacity of your computer’s memory? Storage device? Do you know how to find out?

13. Memory capacity

14. Storage capacity

15. How bits can encode information – a punch card example 1 → Hole 0 → No hole So, there are two ones (punched holes) in this card. The card has 12 rows and 80 columns -- how may 0s are there? What is the total storage capacity of a punched card?

16. Punch cards used a 0/1 code for text See your name in a punch card using the keypunch emulator at kloth.net.kloth.net What is the code for the letter X? Y?

17. Data ≠ Information

18. Summary 0 1 How much data?

19. Self-study questions 1.How many dollars is one megapenny? 2.How many dollars is 1.5 megapennies? 3.We call 8 bits a byte – what do we call 10 pennies? 4.How many eggs in 17 dozen? 5.What is the capacity of your computer’s storage device? 6.What is the capacity of your computer’s memory? 7.How many bits will an 8GB flash drive hold? 8.Which requires more storage – a 1Mb text file or a 1Mb image file? 9.How many bytes in a 27,503 bit file? 10.How many bits in a 27,503 byte file? 11.Which would take longer to transmit across the Internet – a 1Mb text file or a 1Mb image file? 12.At 10 Mb per second, how long will it take to transfer a 20 Mb file across the Internet? 13.At 10 Mb per second, how long will it take to transfer a 20 MB file across the Internet? 14.At 10 Mb per second, how long will it take to transfer a 2 Mb file across the Internet? 15.At 10 Mb per second, how long will it take to transfer a 2 MB file across the Internet? 16.At 10 MB per second, how long will it take to transfer a 20 Mb file across the Internet? 17.At 10 MB per second, how long will it take to transfer a 20 MB file across the Internet? 18.At 10 MB per second, how long will it take to transfer a 2 Mb file across the Internet? 19.At 10 MB per second, how long will it take to transfer a 2 MB file across the Internet? 20.Create a spreadsheet that can convert data quantities (see the calculator on the next slide). 21.Create a spreadsheet to compute data transmission times given transmission speed and file size. 22.You can count and do arithmetic in binary or decimal – what are the advantages and disadvantages of each?

20. Data quantity conversion calculator: http://www.matisse.net/bitcalc/ Resource