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2.4 Computational Logic
- Binary is the representation of the 'presence of electricity'
- If present or 'on' we use a: 1
- If absent or 'off we use a: 0
- If present or 'on' we use a: 1
- Transistor - Component that allows us to
use electrical pulses in a computer
- Logic Gates
- Takes binary inputs and converts them to an output
- AND Gates
- The output will only occur if both inputs are 1
- Can be written as (A ^ B)
- The output will only occur if both inputs are 1
- OR Gates
- The output can occur if only one of the inputs are 1
- Can be written as (A V B)
- The output can occur if only one of the inputs are 1
- NOT Gates
- The output is the opposite of the input (inverts it)
- Can be written as (¬ A)
- Can only have 1 input
- The output is the opposite of the input (inverts it)
- Takes binary inputs and converts them to an output
- Truth Tables
- Output of Logic Gates can be
shown through a truth table
- All possible outputs of a Logic Gate
can be found using a Truth Table
- Number of rows = 2 ^ number of inputs
- Output of Logic Gates can be
shown through a truth table
- Bit - Smallest unit of data in a computer
(Usually either 0 or 1)
- Nibble - 4 bits/half a byte
- Byte - 8 bits
- Byte - 8 bits
- Nibble - 4 bits/half a byte
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