A+ Core 1 study notes- keyboard, power supply

A+ Certification : 220-1001

Memory  |  Display Adapters & Monitors   |  Floppy,CD-ROM & Hard Disk  |  CPU  |  Keyboard & Power Supply  |  Printers & Cables

Networking  |  Operating System  |  Computers  |  Motherboard  |  Security  |  Miscellaneous


Key board connectors:

Key boards come with two types of connectors. They are:

6.Power Supply

DC voltages commonly found in a PC:

One good way of determining a bad power supply is that the fan will not rotate. Also, the computer will not boot and the LED s indicating the power and disk activity will be OFF.

ATX12V 2.0 power supply provides four different voltages: 3.3Volts, 5Volts, 12Volts and -12Volts. Previous versions of ATX12V used to provide -5V, and it has been discontinued in version 2.x.

Uninterrupted Power Supply (UPS):

An UPS is required for any critical and un-interrupted use of computers. It has the following benefits:

Note that the UPS can give un-interrupted power only for a fixed amount of time under a given load, in the absence of line voltage

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