If Vₐ and Vᵦ are inputs (0 or 5 V) and V₀ is the output, identify the logic gates represented by circuits (A) and (B). Image
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Question

If Vₐ and Vᵦ are inputs (0 or 5 V) and V₀ is the output, identify the logic gates represented by circuits (A) and (B). Image

G1 Physics · Accepted Answer

Circuit (A) is diode OR logic: any high input raises V₀. Circuit (B) is a common-emitter transistor inverter, i.e. NOT gate. Therefore the pair is OR and NOT. Correct answer: B.