How PC Power Supplies Work

By: Gary Brown & Talon Homer  | 
budget gaming PC
This budget gaming PC includes a Cooler Master MasterBox Lite 3.1 case, a Gigabyte B360M D3H motherboard, an Intel Pentium Gold G5600 CPU and an EVGA BT450 80+ Bronze power supply. Taken on July 30, 2018. Phil Barker/Future Publishing via Getty Images

If there is any one component that is absolutely vital to the operation of a computer, it is the power supply. Without it, a computer is just an inert box full of plastic and metal. The power supply unit, also known as a PSU, converts the alternating current (AC) line from your home to the direct current (DC) needed by the personal computer. In this article, we'll learn how PC power supplies work and what the wattage ratings mean.

In a personal computer (PC), the power supply is the metal box usually found in a corner of the case. The power supply is visible from the back of many systems because it contains the power-cord receptacle and the cooling fan. A typical PSU will have integrated connectors to send power to the motherboard, microprocessors, and SATA storage. Laptops and mini-PCs usually have their power supplies separate from the computer assembly, instead of integrated into their charging cables.


Power supplies, often referred to as "switching power supplies", use switcher technology to convert the AC input to lower DC voltages. The typical voltages supplied are:

  • 3.3 volts
  • 5 volts
  • 12 volts

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. A watt is the product of the voltage in volts and the current in amperes or amps. If you have been around PCs for many years, you probably remember that the original PCs had large red toggle switches that had a good bit of heft to them. When you turned the PC on or off, you knew you were doing it. These switches actually controlled the flow of 120-volt power to the power supply.

Today you turn on the power with a little push button, and you turn off the machine with a menu option. The operating system can send a signal to the power supply to tell it to turn off. The push button sends a 5-volt signal to the power supply to tell it when to turn on. The power supply also has a circuit that supplies 5 volts, called VSB for "standby voltage" even when it is officially "off", so that the button will work.


Switcher Technology

In this photo you can see three small transformers (yellow) in the center. To the left are two cylindrical capacitors. The large-finned pieces of aluminum are heat sinks. The left heat sink has transistors attached to it. These are the transistors in charge of doing the switching — they provide high-frequency power to the transformers. Attached to the right heat sink are diodes that rectify AC signals and turn them into DC signals.

Prior to 1980 or so, power supplies tended to be heavy and bulky. They used large, heavy transformers and huge capacitors (some as large as soda cans) to convert line voltage at 120 volts and 60 hertz into 5 volts and 12 volts DC.

The switching power supplies used today are much smaller and lighter. They convert the 60-Hertz (Hz, or cycles per second) current to a much higher frequency, meaning more cycles per second. This conversion enables a small, lightweight transformer in the power supply to do the actual voltage step-down from 110 volts (or 220 in certain countries) to the voltage needed by the particular computer component. The higher-frequency AC current provided by a switcher supply is also easier to rectify and filter compared to the original 60-Hz AC line voltage, reducing the variances in voltage for the sensitive electronic components in the computer.


A switcher power supply draws only the power it needs from the AC line. The typical voltages and current provided by a power supply are shown on the label on a power supply.

Switcher technology is also used to make AC from DC, as found in many of the automobile power inverters used to run AC appliances in an automobile and in uninterruptible power supplies. Switcher technology in automotive power inverters changes the direct current from the auto battery into alternating current. The transformer uses alternating current to make the transformer in the inverter step the voltage up to that of household appliances (120 VAC).


Power Supply Standardization

Over time, there have been at least six different standard power supplies for personal computers. In the late 1990s, the industry settled on using ATX-based power supplies, with the latest version being ATX12V 2.0. ATX is an industry specification that means the power supply has the physical characteristics to fit a standard ATX case and the electrical characteristics to work with an ATX motherboard.

PC power-supply cables use standardized, keyed connectors that make it difficult to connect the wrong ones. Also, fan manufacturers often use the same connectors as the power cables for disk drives, allowing a fan to easily obtain the 12 volts it needs. Color-coded wires and industry standard connectors make it possible for the consumer to have many choices for a replacement power supply. If you don't want to deal with so much cable management, you can also buy a non-modular PSU that comes with all its wires already attached.


Windows, Mac, and Linux systems use a string of code called the Advanced Configuration and Power Interface (ACPI) to control and monitor power consumption of components inside the computer. ACPI also decides where to send full, partial, or zero power while the machine is in sleep mode.

Power Supply Wattage

A larger power supply may be needed if you use every available slot on the motherboard. making_ultimate/Getty Images

A 400-watt switching power supply will not necessarily use more power than a 250-watt supply. A larger supply may be needed if you use every available slot on the motherboard or every available drive bay in the personal computer case. It is not a good idea to have a 250-watt supply if you have 250 watts total in devices, since the supply should not be loaded to 100 percent of its capacity. Repeatedly maxing out and exceeding a power supply's given capacity will easily lead to overheating and multiple component failures. Don't do it.

At the heavy-duty end, power supplies can be bought providing 2,000 watts of energy and beyond, but these are only useful for large servers and supercomputers. An average desktop computer consumes about 200 to 300 watts in use, while laptops and mini PCs are made to take 50 watts or less. Upgrading your machine with things like multi-core CPUs, GPUs, SSDs, larger RAM chips, and bigger fans will naturally require more energy consumption.


With that in mind, a higher-capacity power supply is a common supporting mod when installing new components. PC marketplace NewEgg has a handy calculator on their site that you can use to input various parts of your desktop build and get an estimate of its maximum power requirements.

Power supplies of the same form factor ("form factor" refers to the actual shape of the motherboard) are typically differentiated by the wattage they supply and the length of the warranty.


Power Supply Problems

The PC power supply is probably the most failure-prone item in a personal computer. It heats and cools each time it is used and receives the first in-rush of AC current when the PC is switched on. Typically, a stalled cooling fan is a predictor of a power supply failure due to subsequent overheated components. All devices in a PC receive their DC power via the power supply.

A typical failure of a PC power supply is often noticed as a burning smell just before the computer shuts down. Another problem could be the failure of the vital cooling fan, which allows components in the power supply to overheat. Failure symptoms include random rebooting or failure in Windows for no apparent reason.


For any problems you suspect to be the fault of the power supply, use the documentation that came with your computer. If you have ever removed the case from your personal computer to add an adapter card or memory, you can change a power supply. Make sure you remove the power cord first, since voltages are present even though your computer is off.

Power Supply Improvements

Recent motherboard and chipset improvements permit the user to monitor the revolutions per minute (RPM) of the power supply fan via BIOS and a Windows application supplied by the motherboard manufacturer. New designs offer fan control so that the fan only runs the speed needed, depending on cooling needs.

Web servers include power supplies that offer a spare supply that can be exchanged while the other power supply is in use. Some new computers, particularly those designed for use as servers, provide redundant power supplies. This means that there are two or more power supplies in the system, with one providing power and the other acting as a backup. The backup supply immediately takes over in the event of a failure by the primary supply. Then, the primary supply can be exchanged while the other power supply is in use.


Power Supply FAQ

What is the power supply of a computer?
The basic function of a computer's power supply is to convert the main AC to low voltage regulated DC power that is required to power a computer’s components. Most laptops have a battery pack that holds power when unplugged from a wall outlet, while desktop computers draw power from an electrical outlet.
What is a 12V power supply?
A 12V power supply takes any input between 100V and 220V AC, which is what comes from a wall socket, and gives an output of 12V DC.
What does “power supply” mean?
A power supply is an electrical device that is able to supply electric power to an electrical powered device. A modern power supply must output at least 18A on the +12V rail for a modern computer.
What power supply do I need for my gaming PC?
Depending on the GPU, most mid-range gaming PC builds can run on 450-600W PSUs. However, choosing a PSU with a 600 or 650-watt output makes it easier to upgrade later.
How do I check my PC wattage?
The most efficient and easiest way of checking PC wattage is with the help of a watt meter. Alternatively, there are a few different online tools that claim to be able to tell you.