Gate theory
An OR gate is a basic digital logic gate that produces a high output when one or more inputs are high.
Computer Science Logic Gates
OR Gate Simulator With Truth Table
Explore the OR gate and see why the output becomes 1 when at least one input is 1. Learn the Boolean expression, input-output behavior, and digital circuit logic through a focused OpenLabs interactive simulator.
Logic Gate Lab
OR Gate
OR
Y = A + B
Truth Table
| A | B | Output |
|---|---|---|
| 0 | 0 | 0 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 1 |
Toggle the inputs in the lab to watch this table become live circuit behavior.
Input switching
Change binary inputs and observe how the output responds in real time.
Truth table
Map every possible input combination to the correct digital output.
Circuit logic
Connect Boolean algebra with the digital building blocks used inside computers.
Learn by simulating
Understand OR gate logic through live input-output behavior
The OR gate is inclusive: if A is 1, B is 1, or both are 1, the output becomes 1. The simulator helps students connect symbols, Boolean expressions, truth tables, and circuit output without needing physical hardware.
Understand the OR gate Boolean expression and truth table.
Predict output from all input combinations.
Compare OR logic with AND logic.
Use the simulator to observe inclusive logic behavior.
Where this gate is used
- Alarm and trigger systems
- Decision circuits
- Control logic
- Boolean algebra practice
How the interactive lab works
Open the OR gate lab, toggle the binary input controls, and watch the output update immediately. The visual circuit and truth table make each Boolean result easier to verify.
OR Gate FAQs
What is an OR gate?
An OR gate is a digital logic gate that outputs 1 when at least one input is 1.
What is the Boolean expression of an OR gate?
The common Boolean expression is Y = A + B, where plus represents logical OR.
When does an OR gate output 0?
An OR gate outputs 0 only when all of its inputs are 0.
Ready to test the OR gate?
Toggle inputs, verify the truth table, and build confidence with digital logic through a live OpenLabs simulator.