Which logic circuit requires that all inputs are high to activate the output?

The logic circuit that requires all inputs to be high in order to activate the output is AND logic. In an AND gate, the output is only true (or high) when every input provided to the gate is also true (high). This strict requirement ensures that all conditions must be met for the output to be activated, making AND logic essential in applications where a combined condition from multiple factors is necessary.

For example, in a situation where two switches need to be on for a light to illuminate, both switches must be closed (high) for the light to turn on. This characteristic of needing all inputs to be high highlights the fundamental operation of AND logic.

The other types of logic circuits have different operational criteria. OR logic activates the output with just one or more inputs being high. NOT logic inverts the input, producing a false output when the input is true and vice versa. XOR logic outputs true only when the number of true inputs is odd, meaning it can activate the output with less than all inputs being high.