In a two-input AND gate, when is the output equal to 1?

In a two-input AND gate, when is the output equal to 1?

• A. When at least one input is 1
• B. Never
• C. When both inputs are 1
• D. Only when both inputs are 0

Answer: (C)

An AND gate performs the logical AND operation: the output is high only when both inputs are high. For two inputs, the output is 1 exactly when both inputs are 1; if either input is 0, the output is 0. So, out of the four possible input combinations, only when both inputs are 1 does the output become 1.

An AND gate performs the logical AND operation: the output is high only when both inputs are high. For two inputs, the output is 1 exactly when both inputs are 1; if either input is 0, the output is 0. So, out of the four possible input combinations, only when both inputs are 1 does the output become 1.