Flashcards
CP revision
Flashcards do conjunto (14)
- 1How to Convert Binary Units 1 Bit= 1 transistor 1 byte = 8 bits 1 kilobyte = 1000 bytes 1 megabyte = 1000 kilobytes 1 gigabyte = 1000 megabytes 1 terabyte = 1000 gigabytesQuestions
1 Bit= …….
1 byte = ……..
1 kilobyte = ……….
1 megabyte = ………...
1 gigabyte = ………...
1 terabyte = ……………... - 2Binary We use binary because it represents the transistors that can only be on or off 128 64 32 16 8 4 2 1 0 all bits add up to 225Example
128 64 32 16 8 4 2 1 0
1 1 0 = 3 - 3hexadecimal binary = base 2 (2 didgets) decimal (our counting system) = base 10 (10 didgets hexadecimal = base 16 (16 didgets)Questions
1 what is base 2
2 what is base 16
3 what is base 10 - 4hexadecimal (hex) Hex is not used by computers - they only use binary. Hex is used by humans as a "shorthand for binary" Long binary numbers can be represented as a much shorter hexadecimal numberE.G. of binary in hex form
binary = 0010011010101111
hexadecimal = 26AF - 5Binary to Hex 1 split the binary into groups of 4 2 convert each section of 4 to decimal 3 any double didget number needs to be converted to a letter A=10 B=11 ......E.G.
01101011
8421 8421
0110 1011
6 11=B
6B - 6Hexadecimal to binary 1 separate the didgets 2 convert the letters back A=10 B=11 3 convert each number to binaryE.G.
3E
3 E=14
0011 1110
8421 8421 - 7Why do we use Hex? Hex allows us to convert 4 bits at a time (decimal can't do that). by converting 4 bits at a time we can still see the pattern of the binary number.Why do we use Hex?
- 8Binary Logic AND Gate the and gate has an output of 1 only if both the inputs are also 1 E.G. 1 and 1 = 1 0 and 1 = 0DIAGRAM:
- 9OR Gate the or gate has an output of 1 if 1 one the inputs is 1 E.G 1 and 0 = 1 0 and 0 = 0DIAGRAM:
- 10NOT Gate the not gate has 1 input and the output is the opposite E.G. 1=0DIAGRAM:
- 11Logic circuits these gates can be combined into logic circuits circuits using these gates can be hardware that adds and multiplies binary numbers.DIAGRAM:
- 12Questions on Logic circuits 1.What is Z if A and B are 02.What is Z if A and Z are 0
- 13Truth Tables truth tables are tables of every possible input and the associated output they can be used to simplify logic circuitsE.G. of an AND truth table.
This table shows that every possible combo of A and B with their output. - 14E.G. of an OR truth table Remember that the or gate outputs 1 if EITHER inputs are 1E.G. of a NOT truth table
Only 1 input for a not table
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- GCSE Computing FlashCards sobre CP revision, criado por Taig Shelton em 03-02-2020.
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- Taig Shelton
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