Computer Science for IGCSE & O level - Boolean Logic (Section 5 - No. 19)
Which of the following correctly describes the behavior of an OR gate?
The output is high (1) if and only if all inputs are high.
The output is high (1) if at least one of the inputs is high.
The output is high (1) if and only if all inputs are low.
The output is always high (1).
Explanation
An OR gate outputs 1 if any or all of the inputs are 1.