Logic OR GATE - Truth Table , Properties , Advantage , Disadvantage

In digital electronics, an OR gate is a basic logic gate. It gives a low output (0) only when all of its inputs are low (0). For any other combination of inputs, the OR gate gives a high output (1). The OR gate can have two or more inputs, but it always has one output. The main job of the OR gate is to perform the logical "sum" operation, which means it checks if at least one of the inputs is high (1).

For two-input OR GATE , the Boolean expression is given by,

                                                 

Truth Table of OR GATE :

The truth table of a two input OR GATE is given below:

FIND THE TRUTH TABLE USE THE FORMULA = 2 TO THE Nth POWER 

N = TOTAL NUMBER OF INPUT, N = 2 INPUT { A & B }

THEN, 2 TO THE 2 POWER = 4 

THE TOTAL NUMBER OF TRUTH TABLE IS 4  

INPUT		OUTPUT
A	B	A+B
0	0	0
0	1	1
1	0	1
1	1	1

AND Gate Operation

In an OR gate, two switches are set up in parallel. If either one or both of the switches are closed (like in view 1), the lamp will turn on. The lamp will only stay off when both switches are open (like in view 2). This is how an OR gate works, and the circuit acts the same way as this setup.