OR Gate | truth table of two-input OR gate |

OR Gate

The OR gate has many inputs and one output. The symbols of two-input and three-input OR gates are shown in Fig

Symbol of OR gate: (a) two-input, (b) three-input

The Boolean expression of the output (Y ) for a two-input OR gate is given as follows:

Y = A + B 

The truth table of two-input OR gate is

The OR logic function is associative; that is, any OR function with more than two inputs can be realized using  two-input OR functions. 

For example,

Y (A, B, C) = (A + B) + C = A + (B + C)

AND Gate  ,OR Gate,NOT Gate,XOR Gate,NAND Gate, NOR Gate

Universal Gates | NAND Gate | NOR Gate