Logic gates

Logic gates

1. OR gate - a gate which only needs one point to be switched on for the gate to output as on.

2. NOT gate - this gate does the opposite to what is inputted. If the input is on then the gate will output off and vice versa.

3. AND gate - with this gate all the inputs need to be switched on for the gate to output as on. If there is only one switched on then it will still output as off.

4. ' = not, Q = output, u = or, n = and

5. Used to determine whether the logical switches in the CPU are ON/OFF

6. Exam Technique

   • Always label inputs & Outputs
   • A circle in front of an AND/OR inverts the gate making it a NAND/NOR
   • Draw what's in the brackets first (BIDMAS)
   • Don't forgot to draw the circle on the NOT

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