# A+ Essentials Chapter 8

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Power Supplies

In this chapter, you will learn how to

• Explain the basics of electricity
• Describe the details about powering the PC
• Install, maintain, and troubleshoot power supplies

• 1.

### When testing an AC outlet in the U.S., what voltage should the multimetershow between the hot and ground wires?

• A.

120 V

• B.

60 V

• C.

0 V

• D.

–120 V

A. 120 V
Explanation
The multimeter should show 120 V (or thereabouts) between the hot and
ground of a properly wired outlet.

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• 2.

### What voltages does an ATX12V P1 connector provide for the motherboard?

• A.

3.3 V, 5 V

• B.

3.3 V, 12 V

• C.

5 V, 12 V

• D.

3.3 V, 5 V, 12 V

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

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• 3.

### Joachim ordered a new power supply but was surprised when it arrivedbecause it had an extra, 4-wire connector. What is that connector?

• A.

P2 connector for plugging in auxiliary components

• B.

P3 connector for plugging in case fans

• C.

P4 connector for plugging into Pentium 4 and later motherboards

• D.

Aux connector for plugging into a secondary power supply

C. P4 connector for plugging into Pentium 4 and later motherboards
Explanation
The P4 connector goes into the motherboard to support faster
processors.

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• 4.

### What voltages should the two hot wires on a Molex connector read?

• A.

Red = 3.3 V; Yellow = 5 V

• B.

Red = 5 V; Yellow = 12 V

• C.

Red = 12 V; Yellow = 5 V

• D.

Red = 5 V; Yellow = 3.3 V

B. Red = 5 V; Yellow = 12 V
Explanation
A Molex connector’s red wires should be at 5 volts; the yellow wire should
be at 12 volts.

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• 5.

### Why is it a good idea to ensure that the slot covers on your computer case areall covered?

• A.

To maintain good airflow inside your case.

• B.

It helps keep dust and smoke out of your case.

• C.

Both A and B are correct reasons.

• D.

Trick question! Leaving a slot uncovered doesn’t hurt anything.

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

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• 6.

### A PC’s power supply provides DC power in what standard configuration?

• A.

Two primary voltage rails, 12 volts and 5 volts, and an auxiliary 3.3 volt connector.

• B.

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

• C.

One primary DC voltage rail for 12-volt, 5-volt, and 3.3-volt connectors.

• D.

One voltage rail with a 12-volt connector for the motherboard, a second voltage rail with a 12-volt connector for the CPU, and a third voltage rail for the 5-volt and 3.3-volt connectors.

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

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• 7.

### How many pins does a SATA power connector have?

• A.

6

• B.

9

• C.

12

• D.

15

D. 15
Explanation
SATA power connectors have 15 pins.

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• Current Version
• Mar 21, 2023
Quiz Edited by
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• Oct 24, 2008
Quiz Created by
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