How is an OR logic circuit formed?

An OR logic circuit is formed by connecting normally open (N.O.) switches in parallel. This configuration allows any one of the switches to complete the circuit, therefore activating the output when one or more switches are closed.

In a parallel arrangement, if even a single switch is closed, the circuit becomes complete, thus fulfilling the OR logic condition. This means that the circuit can be activated by multiple inputs, representing the essence of the OR logic function, which is to allow at least one true condition (or switch closure) to result in a true output.

The other configurations mentioned do not support the OR functionality effectively. For instance, normally closed (N.C.) switches in series would result in requiring all switches to be open for the circuit to activate, which does not align with the concept of an OR operation. Similarly, normally open switches in series would require all switches to be closed to complete the circuit, contradicting the requirement that only one needs to be activated. A single switch alone does not exemplify the OR logic effectively since it does not provide multiple input possibilities. Thus, connecting N.O. switches in parallel is the correct way to achieve an OR logic circuit.