Chapter 6. Working with Power

Exam Objectives

  • Understanding the features, functions, and installation of ATX power supplies

  • Identifying features and functions of AC adapters

This chapter takes a look at two main items, power supply units (PSU) and uninterruptible power supplies (UPS). Power supplies should actually be called power converters because the largest single function they perform is a conversion of power from 120 volt (V) or 240V to something that can be used by the computer system.

As a CompTIA A+ Certified Professional, you will at least have to add a component to a computer that requires power from the power supply (such as a hard drive), and you will also probably be required to troubleshoot and replace a power supply in the computer system. The information in this chapter gives you all the technical specifications and connector types you will need to know about a power supply. Together with the troubleshooting chapter (Book IV, Chapter 2), you will have all the information that you need to know about power supplies.

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