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How your computer is powered

 All modern computer require electricity to run, whether it is a battery in a laptop or a cord plugged into the wall from a desktop. There were very basic computers a long time ago which did not require electricity, but they were nowhere near as advanced as the computers we have today. They did basic mathematics. Today, while computers are still at their base a mathematical machine, they do so much more with those mathematics. And because of this, they require more energy to function. Electricity is the current best solution for that source of energy.

For desktops, the electricity flows through a standard 3 prong (usually) power cord from an outlet or surge protector. It then plugs into the back of the tower (desktop case) directly into the computer’s power supply unit, or PSU. This converts the AC from the outlet to low voltage regulated DC power. Without it, most of the components of your computer would be overcharged and would be damaged. Once the electric charge is converted, it is sent through many cables out of the PSU and into each individual component.

For laptops, it is a little different. The laptop’s version of the PSU is the power adapter, the large square/rectangle object plugged into the laptop through a cord, also called an AC adapter. This serves the same purpose as the PSU, by converting AC to DC. It then plugs into the laptop, and both charges the battery and powers the laptop. If the battery is unplugged, the AC adapter will still power the laptop, assuming everything is working correctly. Instead of many cords running through the laptop to power each individual port, the DC jack, where the AC adapter plugs into, is directly on the motherboard, and sorts the power through the laptop.

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