Category Archives: Notes

Notes for A+ Exams

HOT SWAPPING

Hot swapping describe the function of replacing computer system components without shutting down the system. More specifically, hot swapping describes replacing components without significant interruption to the system. Hot swapping is useful for the following reasons: * configuration changes *It … Continue reading

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BROWN OUTS: THE EFFECTS OF BROWN OUT ON CIRCUITS, COMPONENTS AND MOTORS

A brownout is an intentional or unintentional drop in voltage in an electrical power supply system. Intentional brownouts are used for load reduction in an emergency. The reduction lasts for minutes or hours, as opposed to short-term voltage sag or … Continue reading

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WHAT IS A VOLT AND HOW DOES IT RELATE TO VOLTAGE?

A single volt is defined as the difference in electric potential across a wire when an electric current of one ampere dissipates one watt of power. It is also equal to the potential difference between two parallel, infinite planes spaced … Continue reading

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BUILT-IN OBSOLESCENCE OR PLANNED OBSCOLESCENCE

Planned obsolescence or built-in obsolescence in industrial design is a policy of planning or designing a product with a limited useful life, so it will become obsolete, that is, unfashionable or no longer functional after a certain period of time. … Continue reading

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PORTS (IDENTIFY PORTS BY VISUAL INSPECTION)

PORTS (IDENTIFY PORTS BY VISUAL INSPECTION) Ethernet ports connect computers to networks via ethernet cables IEEE 1394 port is a serial bus used for audio and video interface and is also widely used as a replacement for scsi interface.  It … Continue reading

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COMPTIA A+ STUDY GUIDE

COMPTIA A+ STUDY GUIDE The Computing Technology Industry Association (CompTIA), a non-profit trade association, was created in 1982 as the Association of Better Computer Dealers, Inc. (ABCD) by representatives of five microcomputer leaderships. Over the course of a decade, ABCD … Continue reading

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