In this gate any of the input is 1 so output is 1. This is basic function of this gate. Basically it will add all the input and gives output. figure below is 2 input OR gate.
Truth table of 2 input OR gate
Basically how it will work like a parallel circuit
Lamp will on by any switch ,irrespective of other switch.
2 input Transistor OR gate .
In real application IC OR gate look like above.
In one IC 4 OR gate will included.
Other Gates
AND Gate
NOT Gate
NAND Gate
NOR Gate
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