A student uses a logic circuit with two inputs, A and B. The output is 1 when A = 0 and B = 0, but 0 for all other input combinations. Which gate is being described?

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Question

A student uses a logic circuit with two inputs, A and B. The output is 1 when A = 0 and B = 0, but 0 for all other input combinations. Which gate is being described?

Accepted Answer

A NOR gate — A NOR gate outputs 1 only when all inputs are 0, which matches the described behaviour. An AND gate outputs 1 only when all inputs are 1. A NAND gate outputs 0 only when all inputs are 1 (and 1 otherwise). An OR gate outputs 1 when at least one input is 1.

Answer

An OR gate

Answer

A NAND gate

Answer

A NOR gate

Answer

An AND gate

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