CompTIA A+® Certification All-In-One For Dummies®, 2nd Edition

6.10. Answers

1. B, C, D. ATX-based power supplies provide power to devices at 3.3VDC, 5VDC, and 12VDC. See "Identifying the Purpose of Power Supply Units".

2. C. Most current computers get power from an ATX power supply. Review "Identifying Power Supplies".

3. A, C. Both of these devices, as well as most other internal devices, affect the total power required by a power supply. Monitors have their own internal power supplies, and most parallel port scanners come with their own AC adapters. Check out "Identifying Power Supplies".

4. B, D. 120VAC and 240VAC are the two power input voltages that are handled by power supplies. Peruse "Identifying the Purpose of Power Supply Units".

5. D. The main function of an AC adapter is to convert AC power into DC power for use in a laptop. Power is provided to the laptop through a connector of some type, but it will be a single voltage and will not be a 20- or 24-pin connector. A UPS would be required to provide power during a blackout. Take a look at "Using AC Adapters".

6. A. Line conditioners can deal with some reduced voltage situations, depending on their severity, but cannot deal with complete blackouts. Peek at "Working with UPS and Suppressors".

7. D. Rapid cutover is a manner of switching to UPS power when using a standby UPS, and the other items are all power line problems that a UPS provides solutions for. Look over "Working with UPS and Suppressors".