OL ICT Lesson 4: Logic Gates (තාර්කික ද්වාර)

AND Gate ($A \cdot B$): Output is 1 only when ALL inputs are 1.
OR Gate ($A + B$): Output is 1 when ANY input is 1.
NOT Gate ($\bar{A}$): Inverts the input (0 $\to$ 1, 1 $\to$ 0). Also called an inverter.

O/L ICT Lesson 04: Logic Gates with Boolean Functions

Bilingual, exam-focused notes for Unit 04 of the Sri Lankan GCE Ordinary Level ICT syllabus (Grade 10). Covers basic logic gates (AND, OR, NOT), truth tables, basic Boolean algebra laws, and introduction to universal gates (NAND, NOR). Includes interactive logic simulators, structured O/L essay questions with model answers, strictly four-option MCQs with explanations, global video resources, and bilingual flashcards.