Types of computer power supplies

Power supply functions:
Transform alternating current into direct current
Provide the correct amount of current and voltage
Protect the PC's internal devices
The voltages handled by the power supply are:
+3.3 V
+- 5V
+-12V
Types of power supplies
AT: They have a power switch, they save energy, power of 250, 300, 350 and 400 Watts.
ATX: It is the most commonly used power supply, it has an ignition booster, power up to 1350 Watts.
How to choose the best power supply:
Power and brand
How many +12V lines it offers
If the power it offers is real or nominal
The type of cooling
If it has a warranty
Active PFC
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