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Mike Meyers' CompTIA A+ Guide to Managing and Troubleshooting PCs Lab Manual, Fifth Edition (Exams 220-901 & 220-902), 5th Edition by Faithe Wempen, Mike Meyers

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Chapter 8

Power Supplies

Lab Exercises

8.01      Electricity

8.02      Testing Power Supply Output

8.03      Choosing a Power Supply

8.04      Replacing a Power Supply

8.05      Power Protection

Lab Analysis Test

Key Term Quiz

 

The power supply in a PC has two important functions: it converts the alternating current (AC) from the wall outlet to direct current (DC), and it supplies that direct current to the various components of the PC in varying voltages, stepping down the voltage as needed.

In a desktop PC, that big metal power supply box inside the case handles these functions, and parses out power to the components via sets of connectors and multicolored wires. In a notebook PC, the power transformation function is handled by the transformer ...

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