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Boolean logic answer explanations

Review worked answers and explanations for Boolean logic. Aligned to OCR Gcse Computer Science.

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A security light system has two sensors: L (for light level) and M (for movement). The light should turn on (Output O) if it is dark AND there is movement, OR if there is movement AND the user has manually overridden the system (Input R). Assume 1 = true/on, 0 = false/off. a) Construct a Boolean expression for Output O using inputs L, M, and R. b) Complete the truth table for this security light system. Include columns for any intermediate values if helpful. | L | M | R | (L' AND M) | (M AND R) | O | |---|---|---|------------|-----------|---| | 0 | 0 | 0 | | | | | 0 | 0 | 1 | | | | | 0 | 1 | 0 | | | | | 0 | 1 | 1 | | | | | 1 | 0 | 0 | | | | | 1 | 0 | 1 | | | | | 1 | 1 | 0 | | | | | 1 | 1 | 1 | | | | [8 marks]

Boolean logic answers | OCR GCSE Computer Science | ExamCompanion