10.

• Logic gates and logic circuits are introduced in this video
• The logic diagram shown is an example of a half adder circuit
• Logic gates covered in the video

  • NOT gate
  • AND gate
  • OR gate
  • NAND gate
  • NOR gate
  • XOR gate
• NOT gate


  Reverses the input - if input is 0, output is 1, and if input is 1, output is 0
• AND gate


  Output is true (1) if both inputs are true (1), otherwise output is false (0)
• OR gate


  Output is true (1) if at least one of the inputs is true (1), otherwise output is false (0)
• NAND gate


  Reverses the output of an AND gate - output is true (1) if at least one input is false (0), otherwise output is false (0)
• NOR gate


  Reverses the output of an OR gate - output is true (1) if both inputs are false (0), otherwise output is false (0)
• XOR (Exclusive OR) gate

  Output is true (1) if one and only one of the inputs is true (1), otherwise output is false (0)
• The video provides a summary of the 6 logic gates and their associated truth tables
• The video suggests mnemonic techniques to help remember the logic gate symbols
• Logic circuit


  A diagram that shows how logic gates are connected to perform a specific logical function
• Truth table


  A table that lists all possible input combinations and the corresponding output
• Logical expression


  A mathematical expression using Boolean operators (AND, OR, NOT) to represent a logical function
• Creating a logic circuit

  Identify the inputs and outputs

  2. Determine the logical operations required

  3. Select the appropriate logic gates

  4. Connect the logic gates to form the circuit
• Completing a truth table

  List all possible input combinations

  2. Determine the output for each input combination

  3. Fill in the truth table
• Writing a logical expression

  Identify the output

  2. Express the logical operations using Boolean operators

  3. Combine the inputs and operators to form the expression
• Logic circuit, truth table, and logical expression


  They are alternative ways of representing the same logical function
• A five alarm goes off if either the temperature inside the building rises above 60 degrees Celsius or someone manually activates a fire alarm. A firefighter should be able to manually shut the alarm off regardless of how the alarm was triggered.