| A | B |
|---|
| Voltage | force that pushes electricity through a wire |
| Current | The flow of electricity through a wire |
| Resistance | Opposition to the flow of electricity |
| Amp | The measure of the strength of the current of electricity |
| FRU | devices that can be added or replaced in the field |
| FRUs do not require any soldering and are | easy to remove and install |
| Loop-back plugs can provide important diagnostic information while troubleshooting | serial and parallel ports |
| To determine if a material used in PC repairs or preventive maintenance is classified as hazardous, consult | the Material Safety Data Sheet (MSDS). |
| MSDS is used to inform workers and management about | hazards associated with the products and how to handle them safely. |
| sag | a drop in power that lasts less than a second |
| Spikes | sudden increases in voltage that are much higher than normal levels, usually caused by lightning strikes |
| A surge is a brief | increase in voltage that is usually caused by high demands on the power grid in a local area |
| Brownout a drop in power that can be caused intentionally by | the utility companies seeking to reduce the power drawn by users during peak demand periods |
| Noise is caused by | interference from radio broadcasts, generators, and lightning |
| Ohms | Used to measure resistance |
| Blackouts are | the complete loss of power for any amount of time |
| phosphor | coating that is applied to the inside of the monitor |
| capacitor used to | store electricity for only a short period of time |
| battery used to | store electricity for long period of time |
| A Resistance, or Continuity Test, is performed by a digital multimeter (DMM) to | test fuses to verify that they have zero resistance |
| AC current comes out of the | wall outlet and must be converted to DC for computer use |
| DC current is output by the | computer's powersupply for use by computer |
| surge suppressor | Used to prevent higher-than-normal voltages from damaging equipment |
| UPS | gives the device a steady stream of power with no delay |
| When the incoming voltage drops below | an acceptable amount the SPS switches to battery power |
| The SPS battery is on | standby during the normal operation of the unit |
| If possible, make sure the relative humidity is | greater than 50% |
| Work at an anit-static workstation equipped with | tiled floors, a grounding strap and a grounding mat |
| CPU fan failure will cause internally high temperatures that can result in | probable CPU failure |
| a multimeter is a diagnostic tool used to | check for a good fuse inside a computer |
| When performing a motherboad test with a digital multimeter (DMM) the expected results | could be +12V, -12V, +5V, or -5V |
| 37. The computer's power supply converts the current coming from the wall jack from | Alternating Current (AC) into Direct Current (DC) |
| During the POST if a keyboard is not properly connected, the user might get a | beep code or a "301 error message" |
| During normal operation, the computer will boot from the OS loaded on | the hard drive that is set to master. |
| If two hard drives are configured on the same ribbon cable, they | must have a master slave relationship. |
| The hard drive that is set to slave provides | extra storage capabilities. |
| When two drives are installed, the majority of problems will result from | improperly set jumpers or incorrect BIOS settings. |
| The POST is stored in the | computer ROM BIOS. |
| If the BIOS encounters any hardware errors while running the POST routine, it | will issue a series of beeps. |
| As a rule, attach the SCSI controller set to | the highest priority SCSI ID #7 |
| Most Errors can be traced back to | user events such as downloading or installing applications |
