Which term refers to a simple control circuit that uses two conductors?

• A. Two-wire
• B. Multistrand
• C. Solid Core
• D. Multiconductor

Answer: (A)

Two-wire describes the simplest control circuit, using just a pair of conductors to form the complete path between the controller and the device being controlled. With two wires, one carries the control voltage to the device and the other provides the return, so the circuit can be opened or closed to energize or de-energize the load. The other options refer to how the conductor is built (solid core vs. stranded) or to having more than two conductors in the cable, which are about construction or cable count rather than the basic two-conductor control loop.