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Hardware & Software / Boolean Logic GapFill
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A computer system comprises of the physical components that can be seen and touched, the , and software which are all the programs, including the operating system. The gives the computer system the instructions in the programs and the hardware carries out those instructions by processing inputs and outputting the results.
A key part of the hardware is the transistors or electronic switches which are either on or off and represent the values 1 and 0. Nineteenth-century mathematician George Boole discovered that all decisions could only be either true or false, Boolean values and Boolean logic is named after him.
There are four different logic gates that you need to know. Each logic gate has one or two inputs and one output.
| NOT GATE | AND GATE | |||||||||||||||||||||
| This gate reverses the value of the input |
for the output to be True | |||||||||||||||||||||
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Q = | Q = |
| OR GATE | GATE | ||||||||||||||||||||||||||||||
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must be True for the output to be True | This gate will output True when only 1 input is True, and if both are True it will output 0. | ||||||||||||||||||||||||||||||
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| Q = A + B | Q = |
These logic gates can be connected together to create more complex logic circuits from a given equation:
Q = C. (A+B)