AND OR

In this animated AND Logic example of Doors Opening and Closing, you can see that in order for the "Light" to get through the house, the front door AND the back door must be Open.

Same example: if either the front door OR the back door is Closed the light does NOT get through.
In this animated OR Logic example, you can see that in order to get light through the house: the left front door OR the right front door (or both) must be Open.
Same example: in order to block the light through the house: the left front door AND the right front door must be Closed.

In order for the Output of an AND Logical Function to be TRUE: input (1) AND input (2) must both be TRUE. This is Positive Logic. Hint: TRUE is when the switch is closed, applying power to the LED. FALSE is when the switch is open, NOT applying power to the LED)



Using the Same Function --It is also correct to say: If either input (1) OR input (2) (or both) is NOT TRUE the Output Will be FALSE. This is Negative Logic.
In order for the Output of an OR Logical Function to be TRUE: either
input (1) OR input (2) (or both) must be TRUE. This is Positive Logic.



Using the Same Function --It is also correct to say: In order for the Output to be FALSE: input (1) AND input (2) must both be FALSE. This is Negative Logic.

Remember:
1) A Positive AND gate is a Negative OR gate
2) A Positive OR gate is a Negative AND gate
Logic Element Symbols