The power supply converts (ps) household current from 115 voltage to four DC voltages. They are +12, -12, +5, and -5 volts. Now you ask yourself why DC and those voltages?
Because the devices and components of a computer work on DC current. It is cheaper to make a DC device than a AC device, DC devices create less heat. DC motors are more efficient than AC motors (there are motors in fans, hard drives, floppy drives, tape drives, and CD ROM drives).
So lets talk about the ps First and Foremost DO NOT open up a power supply! A defective one is even more dangerous. The ps is made up of capacitors, diodes, resistors, transistors (yes they are still around) and coils.
The main reason I say do not open a ps is the capacitors, capacitors retain power (voltage with amperage) that is their function. A good capacitor can retain the designed capacity for long period, depending on the composition and quality of the capacitor it can be years. It does not take very much current to kill you. (incase you are interested: voltage + amperage = current, where voltage is amount, amperage is the pressure, current is the flow)
Modern power supplies are sealed so you don't have to worry about getting shocked if you change one out.
Lets look at a power supply from your point of view:
You go to turn on your computer - nada.
So you go down the checklist of probable causes:
House power on? Check
Power at the receptacle? Check (the lamp next to the computer is on right?)
Unplugged and repluged in the power cable to both the receptacle and the computer? Check
No Addiction
Aire Bra
Sandhi Sudha
Body Buildo
Shakti Prash
Hanuman Chalisa Yantra
Hot Shapers
Because the devices and components of a computer work on DC current. It is cheaper to make a DC device than a AC device, DC devices create less heat. DC motors are more efficient than AC motors (there are motors in fans, hard drives, floppy drives, tape drives, and CD ROM drives).
So lets talk about the ps First and Foremost DO NOT open up a power supply! A defective one is even more dangerous. The ps is made up of capacitors, diodes, resistors, transistors (yes they are still around) and coils.
The main reason I say do not open a ps is the capacitors, capacitors retain power (voltage with amperage) that is their function. A good capacitor can retain the designed capacity for long period, depending on the composition and quality of the capacitor it can be years. It does not take very much current to kill you. (incase you are interested: voltage + amperage = current, where voltage is amount, amperage is the pressure, current is the flow)
Modern power supplies are sealed so you don't have to worry about getting shocked if you change one out.
Lets look at a power supply from your point of view:
You go to turn on your computer - nada.
So you go down the checklist of probable causes:
House power on? Check
Power at the receptacle? Check (the lamp next to the computer is on right?)
Unplugged and repluged in the power cable to both the receptacle and the computer? Check
No Addiction
Aire Bra
Sandhi Sudha
Body Buildo
Shakti Prash
Hanuman Chalisa Yantra
Hot Shapers
What is a power supply?
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