Atx Power Supply — CompTIA A+ Core 1 (220-1101) Practice Questions

The ATX (Advanced Technology eXtended) power supply is the dominant form factor used in desktop computers and is a core topic on the CompTIA A+ Core 1 exam. It delivers multiple DC voltage rails, including 3.3 V, 5 V, and 12 V, to power motherboards, drives, expansion cards, and other components through standardized connectors. Technicians must understand wattage ratings, efficiency ratings (80 Plus tiers), and the purpose of each connector type when selecting or replacing a power supply. Knowing how to test a power supply with a multimeter or POST card and interpret voltage tolerances is directly tested on the exam.

Free questions on atx power supply