AND Gate,OR Gate,NOT Gate

AND
Operation:

Logical operation used to multiply the
binary inputs

Symbol:

it is represented by (.) symbol. X=A.B is
read as X is  equal to A AND B

And
Gate:

Electronic circuit used to implement AND
operation is called AND Gate.

Circuit
Diagram:

Switches
connected in series represent AND Gate

Result:

Output is 1 only when all the inputs are
one. Output is zero when any of the inputs is zero.

Logical operation used to add  the binary inputs

Symbol:

it is represented by (+) symbol. X=A+B is
read as X is  equal to A OR B

OR
Gate:

Electronic circuit used to implement OR
operation is called OR Gate.

Circuit
Diagram:

Switches connected in parallel represent
OR Gate.

NOT
Operation:

Logical operation used to invert the
value of binary input.

Symbol:

it is represented by (-) symbol. X=A ̅ is
read as X is  equal to A NOT

NOT
Gate:

Electronic circuit used to implement NOT
operation is called NOT Gate.

Circuit
Diagram:

Switch and output are connected in
parallel.