Mike Myers_Chapter 7_Power Supplies

A) 120 V

U.S. outlets run at 120 V.

A) 3.3 V, 5 V, 12 V

An ATX12V power supply P1 connector provides 3.3, 5, and 12 volts to the motherboard.

C) PCIe

Better video cards require one or two 6- or 8-pin PCIe connectors.

B) P4 connector for plugging into modern motherboards

The P4 connector goes into the motherboard to support more power-hungry chips.

C) DC has polarity. The red lead should always touch the hot wire; the black lead should touch a ground wire.

DC has polarity. The red lead should always touch the hot wire; the black lead should touch a ground wire.

D) Red = 5 V; Yellow = 12 V

A Molex connector’s red wires should be at 5 volts; the yellow wire should be at 12 volts.

C) Both A and B are correct reasons.

Both A and B are correct reasons. Keeping the slots covered helps keep a good airflow in your case and keeps the dust and smoke away from all those sensitive internal components.

D) Three primary voltage rails, one each for 12-volt, 5-volt, and 3.3-volt connectors

The standard PC power supply configuration has three primary voltage rails, one each for 12-volt, 5-volt, and 3.3-volt connectors.

D) Soft power

The soft power feature of ATX systems prevents a user from turning off a system before the operating system has been shut down.

A) 15

SATA power connectors have 15 pins.

B) 12 v

• The ATX power supply unit has 3.3 v, 5.0 v, and 12 v powering the different devices in your PC.
• Incorrect Answers:
• Modern PSUs do not supply 2 v, 6 v, or 10 v currents.

C) Efficiency

• Efficiency is a major consideration.
• Incorrect Answers:
• Cable length is important, but most power cables are of sufficient length and don't typically need to be measured or checked.
• Power supplies do not have a sag rating.
• UPS compatibility is not a real specification.

D) Modular power supply

• A modular power supply simplifies cable management by enabling you to add and remove optional plug-in cables as needed to power components.
• Incorrect Answer:
• Option power supply is a made-up term.
• A Flex power supply is a small-form-factor power supply.
• A soldered power supply has all of its power cables soldered to the power supply unit (PSU).

B) Wattage

• Wattage is the primary concern in selecting a power supply.
• Incorrect Answers:
• Airflow on a power supply is pre-designed for the maximum capability of the power supply.
• Â Power supplies do not have trip alerts or USB power plugs.

C) AC

• Alternating current (AC) experiences less loss than direct current (DC) when traveling over wires.
• Incorrect Answers:
• The source of the power such as wind, nuclear, solar, etc. has no impact on electricity's ability to maintain voltage as it moves down a wire.

B)  Modular power supply

A modular power supply simplifies cable management by enabling you to add and remove optional plug-in cables as needed to power components. Option power supply is a made-up term. A Flex power supply is a small-form-factor power supply. A soldered power supply has all of its power cables soldered to the power supply unit (PSU).

B) Provides wall power to the power supply

It allows power to flow from the plug into the power supply. The computer has its own on/off switch. The power supply powers the "power good" wire (if the power is good) but the power supply switch does not do this directly. Power supplies (mostly) do not autodetect power and then react.

A)  Efficiency

Efficiency is a major consideration. Cable length is important, but most power cables are of sufficient length and don't typically need to be measured or checked. Power supplies do not have a sag rating. UPS compatibility is not a real specification.

D)  Build up static electricity

Vacuums generate a lot of static electricity, specifically on the plastic areas of the device, including the nozzle. While niche anti-static PC vacuums exist, it is always best to use canned air to blow dust out of your PC.

D)  All of the above

We always want to practice proper power handling, especially when dealing with the source of the power, our PSU. Power supply testers can be used to test a PSU and verify that it is functioning as intended. Many technicians keep spares of common components such as PSUs, so that they can swap a known working one into the system and test their theory of probable causation.