TestOut LabSim A+ Certification Practice Exam

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What function does an ATX power supply serve?

Converts AC to DC
Manages thermal output of components
Controls system boot sequence
Regulates voltage levels

The correct answer is: Converts AC to DC

An ATX power supply primarily serves the function of converting alternating current (AC) from the wall outlet into direct current (DC) which is essential for computer components to operate. Most computer components, such as the motherboard, hard drives, and cooling fans, require DC voltage to function properly. When plugged into an electrical outlet, the ATX power supply takes the standard AC power (typically 120V or 240V) and transforms it into several different voltages of DC, like +12V, +5V, and +3.3V, which are used by different parts of the computer. This conversion process is essential for the functionality of the entire system, as electronic components have specific voltage requirements that must be met to ensure reliability and performance. Although managing thermal output, controlling the boot sequence, and regulating voltage levels are important functions within a computer system, they do not pertain directly to the primary role of the ATX power supply.