Appendix C: Equipment log and configuration worksheets
198
Calculating the total combined power used by the system1 From the previous worksheet, enter the total current for each
column in the Power Usage Worksheet 2.
2 Multiply the voltage by the total current to get the total wattage
for each voltage level.
3 Add the total wattage for each voltage level to arrive at the total
combined power usage of the power supply.
3rd 5.25-inch
peripheral
drive
+3.3 V +5 V 5 V
Standby +12 V -12 V
Fans
Total
Current
Power Usage Worksheet 2
Voltage level and total current
(V x A = W)
Total Watts for each voltage
level
(+3.3 V) x (______ A) ________ W
(+5 V) x (______ A) ________ W
(-5 V) x (______ A) ________ W
(+12 V) x (______ A) ________ W
(-12 V) x (______ A) ________ W
Total Combined Wattage ________ W
Power Usage Worksheet 1
Device Current (maximum) voltage level
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