# Wht kind of current comes out? - Computers & Internet

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• Fernando Gomes Nov 08, 2012

Thank you for you help, but what I am trying to know is which wires are going to give me 12 volts.

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• Computers & ... Master

Voltage;

Input voltage into the Power Supply of the computer is AC Voltage.
100, or 120, or 220, or 240 Volts; depending on what country you are in.

Output voltage coming out of the Power Supply is divided, into three main power rails;

A) 3.3 Volt
B) 5 Volt
C) 12 Volt
ALL are DC Voltage.

In comparison two D cell batteries store 3 Volts DC.

The Power Supply in your computer converts dangerous high AC Voltage, into three low DC voltages.
AC voltage is rectified into DC voltage.

The dangerous voltages are contained in the metal case, of the Power Supply.

Current = Amperage.
Current is measured in Amperage.

http://en.wikipedia.org/wiki/Amperage

To know the rated current of each Voltage power rail, look at the chart on the Power Supply's case.

Across the top usually are listed the voltage power rails.
Look down from 3.3V+, 5V+, and 12V+
Forget about the Negative values; 3.3V-, 5V-, and 12V-

If more than one 12 Volt power rail is listed, ADD all 12 Volt power rail Amperage together.
Example;

12V1 - 20A
12V2 - 22A
42 Amp's on the 12 Volt power rail.

Add all power rails amperage together, (3.3V+, 5V+, 12V+), and multiply times the input voltage, to come up with the actual rated maximum Wattage.

Regards,
joecoolvette

Posted on Nov 06, 2012

• joecoolvette Nov 08, 2012

Then you weren't asking about Current, or Amperage; you were asking about Voltage, and color coding of the wires. Orange is 3.3 Volts DC. Red is 5 Volts DC. Yellow is 12 Volts DC. ALL Black wires are Ground wires. ALL Black wires are NEGATIVE wires. The computer uses a DC circuit. With a DC circuit there is a Positive, and a Negative. ALL power wires, (3.3 Volts, 5 Volts, and 12 Volts), are Positive wires. 1)http://en.wikipedia.org/wiki/Computer_po... 2)http://www.playtool.com/pages/psuconnect...

• joecoolvette Nov 08, 2012

Crude example; Using a garden hose and water. Voltage is the size of the opening of the garden hose. What size stream comes out, you might say. Amperage, or Current, is how many gallons per minute come out of the garden hose. Voltage times Amperage = Watts.

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• Master

The computer's switch mode power supply produces DC (direct current) electricity.

Posted on Nov 06, 2012

• Chris Hingee Nov 09, 2012

On the power connector that has 4 wires, Yellow wire is +12 volts and the black is the 0 volts (ground) Red wire is +5 volts and the black is the 0 volts (ground).

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Posted on Jan 02, 2017

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