Boolean Logic

• Voltage is the pressure that forces the charged electrons to flow in an electrical circuit.
• A logic gate is a very small component in a computer system that controls the flow of electricity.
• A logic expression is a mathematical representation that is used to represent an electrical circuit or system.
• NOT gate:

  A X

  1 0

  0 1

  
• AND gate:

  A B X

  0 0 0

  0 1 0

  1 0 0

  1 1 1

  
• OR gate:

  A B X

  0 0 0

  0 1 1

  1 0 1

  1 1 1

  
• NAND gate:

  A B X

  0 0 1

  0 1 1

  1 0 1

  1 1 0

  
• NOR gate:

  A B X

  0 0 1

  0 1 0

  1 0 0

  1 1 0

  
• XOR gate:

  A B X

  0 0 0

  0 1 1

  1 0 1

  1 1 0