TestOut LabSim A+ Certification Practice Exam

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What component is responsible for converting AC to DC in a computer system?

Power Supply
Motherboard
Cooling Fan
Hard Drive

The correct answer is: Power Supply

The power supply unit (PSU) is the component that converts alternating current (AC) from the wall outlet into direct current (DC) that the computer's components can use. This conversion is critical because most internal computer components, such as the motherboard, CPU, and drives, require DC power to operate effectively. In addition to converting AC to DC, the power supply also regulates voltage levels and distributes power to various components within the system. While other components like the motherboard, cooling fan, and hard drive play crucial roles in the system's operation, they do not perform the function of converting AC to DC. The motherboard connects and manages the communication between components, the cooling fan helps in heat dissipation, and the hard drive is responsible for data storage, but none of these components are involved in the power conversion process.