In a three-way switch circuit, how many switches are needed?

In a three-way switch circuit, two switches are required to control a single light fixture from two different locations. This is achieved by using two three-way switches, which allow for the light to be turned on or off from either location. The configuration involves the connection of the switches in such a way that the circuit can be completed regardless of the position of either switch.

When one switch is flipped, it alters the current pathway, enabling control over the light fixture from another point in the room or hallway. This is a common setup in places such as stairwells or large rooms where access to light control from multiple entry points is beneficial. Utilizing more than two switches, as suggested by some of the other options, is not standard practice for a basic three-way circuit configuration and would typically require additional wiring and might complicate the circuit unnecessarily.