Computer Power Supply Voltages
3.3 Volts is used to power the CPU. 12 Volts can also be applied to specific “smart” chassis fans. Power supply can convert to a 100 Volt electrical current to +12V, -12V, +5V, -5V, and +3.3 V.
What are the four voltages produced by an AT power supply?
Standard output voltages
The positive output voltages produced by a power supply unit are +3.3V, +5V and +12V. Negative voltages of -5V and -12V are also provided, together with a +5V standby voltage.
What are the 3 voltages supplied by the power supply?
The 3.3- and 5-volts are typically used by digital circuits, while the 12-volt is used to run motors in disk drives and fans. The main specification of a power supply is in watts.
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The typical voltages supplied are:
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The typical voltages supplied are:
- 3.3 volts.
- 5 volts.
- 12 volts.
