Formats comparisonĪTX power supplies have mandatory measurements of 15 cm wide x 8.6 high and may have different lengths. Having smaller dimensions than ATX, they require a more compact design to be able to reach a maximum power of up to 700 watts. They are power supplies with a format specially designed for compact equipment, so they will fit into small boxes. They turn on and off electronically when we turn the computer on or off. This type of power supply are designed to work with ATX form factor motherboards (ATX, micro ATX, or FlexATX). Although it is highly unlikely that you will come across one of them, you will be able to distinguish it quickly because it has a physical switch to turn it on or off. Nowadays totally in disuse, the reason why I will not go into describing these power supplies. It is the oldest power supply type, designed to work with AT motherboards. And others of smaller dimensions will have to work with less power, but will take up less space and will fit into smaller boxes. Thus, we will have larger sources that allow us to work with more power since it will be easier to dissipate the heat and place larger fans to facilitate dissipation. The form factor determines the dimensions of the power supply, so it fits well in one box or another, which were sized taking motherboard type in mind. Here the form factor of the motherboard comes into play again, which we already saw in a previous post and which determines the type of components that can be connected to the motherboard. It can be found different types of power supplies depending on the motherboard for which they have been designed. Connector to devices with extra power needs.The connector to power the internal devices.You can also see the fan that helps dissipate the generated heat. The plates of the transformer can be appreciated in the figure (remember that it does not generate electricity but it transforms the alternating current into a direct current of lower voltage). In the following figure, you can see the inside of an ATX power supply. Usually, a computer needs a 12-volt direct current to power the motors of devices, such as hard drives, and a 5-volt or 3.3-volt direct current for the different electronic components. Therefore, although we normally refer to the Power Supply with that name, it does not generate electricity, it is not a source, but a transformer from alternating current to direct current, and from high voltage to low voltage. We take the electrical current from the electric supply network, to which we plug the PC Power Supply, which transforms alternating current into direct current, at suitable voltages for the computer devices. The power supply is the component of the computer that fulfils this function. All the devices connected to the motherboard, need to be supplied with the electrical current for their operation.
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