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Chapter 5

Chapter 5 - Power Supplies and the Cooling System

QuestionAnswer
What is the function of the PSU? To convert high voltage AC current to low voltage DC current. Provides power to internal devices.
What voltage do yellow wires inside the PC carry? 12 volts, usually to the CPU and hard drive motors.
What voltage do red wires inside the PC carry? 5 volts, usually to power circuit boards and fans.
What voltage do orange wires inside the PC carry? 3.3 volts, usually to power circuit boards.
What voltage do black wires inside the PC carry? 0 volts. Black is always ground.
What is soft power? Used in ATX and later motherboards. When the power button is pressed the motherboard sends a signal to the PSU to turn on the rest of the computer system. Allows you to do a polite shutdown when powering off the system.
Created by: aharner
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