A transformer in an irrigation controller reduces 120 volts to approximately 24 volts. Why is this voltage used for valves?

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Prepare for the CR-21 Landscapes and Irrigation Test. Utilize flashcards and multiple-choice questions featuring hints and explanations. Get exam-ready!

Multiple Choice

A transformer in an irrigation controller reduces 120 volts to approximately 24 volts. Why is this voltage used for valves?

Explanation:
Low voltage is used for valves to improve safety. The transformer steps 120 VAC down to about 24 VAC so the valve solenoids can be energized with a relatively small, safer current. This voltage is enough to reliably operate the valve while keeping the risk of electrical shock low for anyone who might touch the wiring or components. It also allows the controller to switch the valves with simple relays or electronics and keeps wiring cost and size manageable. Higher voltages would pose a real shock hazard and aren’t necessary for reliable valve operation, while much lower voltages wouldn’t reliably energize the solenoids.

Low voltage is used for valves to improve safety. The transformer steps 120 VAC down to about 24 VAC so the valve solenoids can be energized with a relatively small, safer current. This voltage is enough to reliably operate the valve while keeping the risk of electrical shock low for anyone who might touch the wiring or components. It also allows the controller to switch the valves with simple relays or electronics and keeps wiring cost and size manageable. Higher voltages would pose a real shock hazard and aren’t necessary for reliable valve operation, while much lower voltages wouldn’t reliably energize the solenoids.

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