How many inputs does an OR gate logic circuit have at minimum?

An OR gate logic circuit can function with a minimum of two inputs. The primary purpose of an OR gate is to output a high signal (logic '1') when at least one of its inputs is high. While it is technically possible to have an OR gate with just a single input, it would not serve the typical purpose of the gate, which is to compare multiple inputs and provide a true result based on the logical operation. The minimum configuration that illustrates the essence of an OR operation effectively requires two inputs, which allows for the evaluation of at least two different signals. This configuration showcases the fundamental characteristic of the OR gate, enabling it to demonstrate its true functionality.

Having two inputs means that the gate can output a high signal if either input is high, which perfectly encapsulates the logic of disjunction in Boolean algebra. Consequently, selecting two as the minimum number of inputs aligns with the basic understanding of how OR gates operate in digital electronics.