Question

Write the Boolean expressions for an OR gate.

Answer 1

It is a circuit with two or more inputs and one output in which the output signal is high if any one or more of the inputs is high. The or operation represents a logical addition.
The figure shows the 2-input or gale logic symbol, and the Boolean expression, and the truth table for the or function.

Logic symbol:

Boolean expression: Y = A + B

Truth table:

Inputs		Output Y
A	B
0	0	0
1	0	1
0	1	1
1	1	1