Which valve accessory component provides the source of electrical power to field devices?

• A. Data Loggers
• B. Housings
• C. Power Supply
• D. Grounding

Answer: (C)

The essential idea is that field devices need a source of electrical energy to operate, and the component designed to provide that energy is the power supply. It converts incoming utility power to the appropriate low voltage (often 24 VAC) and delivers it to solenoids, sensors, and other field devices so they can energize when commanded. Data loggers, housings, and grounding serve other roles—data logging, protection, and safety—rather than supplying the energy needed to drive the valves. So the power supply is the component that truly furnishes the electrical power to field devices.