AND, OR, NOT

The basic building blocks

An interactive lesson with 6 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• AND: 1 only if all inputs are 1. OR: 1 if any input is 1. NOT: flips.
• A truth table lists the output for all $2^n$ input combinations.
• XOR outputs 1 when its inputs differ.

Steps

1. Bits as voltages
2. An AND gate
3. Turn off the lamp
4. Rows in the table
5. A mystery gate
6. Name that gate