Which gate has output 0 when at least one input is 1?

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Study for the AAMI Certified Associate in Biomedical Technology Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Which gate has output 0 when at least one input is 1?

Explanation:
In digital logic, a NOR gate outputs 1 only when all inputs are 0; otherwise it outputs 0. This happens because NOR is the NOT of OR: if any input is 1, OR would be 1, and NOR inverts that to 0. Therefore, if at least one input is 1, the output is 0. For two inputs, that yields 1 for 0/0 and 0 for 1/0, 0 for 0/1, and 0 for 1/1. The other gates don’t fit this condition: AND outputs 0 only if an input is 0; OR outputs 1 if any input is 1; NAND outputs 0 only when all inputs are 1.

In digital logic, a NOR gate outputs 1 only when all inputs are 0; otherwise it outputs 0. This happens because NOR is the NOT of OR: if any input is 1, OR would be 1, and NOR inverts that to 0. Therefore, if at least one input is 1, the output is 0. For two inputs, that yields 1 for 0/0 and 0 for 1/0, 0 for 0/1, and 0 for 1/1. The other gates don’t fit this condition: AND outputs 0 only if an input is 0; OR outputs 1 if any input is 1; NAND outputs 0 only when all inputs are 1.

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