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Logic gates operate on Boolean inputs: 0 is false and 1 is true. Learn both each gate's behaviour and its drawn symbol. Inputs enter on the left; the output leaves on the right. A small circle indicates inversion (NOT).
Gate | When its output is 1 |
|---|---|
AND | Both inputs are 1 |
OR | At least one input is 1 |
NOT | Its single input is 0 |
NAND | Not both inputs are 1 |
NOR | Both inputs are 0 |
XOR | Exactly one input is 1 |
Worked comparison
For A=1 and B=1, AND and OR output 1, while XOR outputs 0. XOR is not simply another drawing of OR. NOT has one input; the other gates here have two.
Drawing practice
On paper draw each gate without looking, label its inputs/output, then compare with the symbol sheet. Check the curved AND/OR shapes, the extra input curve for XOR, and the inversion circles for NOT/NAND/NOR. State each gate's output for 0,0 and 1,1 before submitting the structured checks.
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Application: Gate behaviour
Application: Gate behaviour
- For inputs 1 and 1, XOR output: [Space 1]
- For inputs 0 and 0, NOR output: [Space 2]
- For inputs 1 and 0, NAND output: [Space 3]
Interactive exercises for Module 2 and beyond require an active plan.