| A | B |
|---|
| AC | Alternating Current (flows in both directions) |
| DC | Direct Current (flows in single direction) |
| Voltage | Speed of electricity |
| Amps | Volume of electricity |
| Ohms | Resistance |
| Computer output voltages | +5, +12, -5, -12 Vdc |
| Computer output voltage -- orange | Power Good Signal +5 (0 if bad) |
| POWER GOOD signal | Boolean AND of other voltages, resets motherboard if 0 |
| Computer output -- black | Ground |
| Multimeter -- important features | Continuity test and auto shut off |
| DB9 serial connection | Can be set to either COM1 or COM2 |
| UPS | Uninterruptible Power Supply |
| 5 types of power faults | Blackout, brownout, surge, sag, spike |
| Best way to avoid power fault | buy and install proper sized surge supressor |
| P8 and P9 connection | Black wires together |
| ATX power supply advantage | Auto shut off by motherboard.software |
| Rectifier | Converts AC to DC |
| AT power supply connections | P8 and P9 -- black (ground) next to black |
| Surge Suppressor | Protects against overvoltage or spikes |
