Power Supplies are usually measured primarily by their wattage. IE, 650 watt, 750 watt, 1000 watt, etc.
This can be misleading, however, as PSUs are divided into many different areas.
First you want a high enough wattage to run your computer, plus some breathing room. Most PSUs run at 75% or less of what they'te 'rated' for. Look for 80 PLUS certifications. This means the PSU is more efficient and provides closer to advertised power.
80 PLUS Certified means it provides 80% of the rating
BRONZE is even more, SILVER higher still, and GOLD means the highest (~95%)
You should generally factor in your CPU's wattage, and your videocard's reccomendations. Most PCs are okay in the 650 watt zone with a dual or triple core CPU and a single videocard. But for quad-cores, or systems with high-end or multiple videocards, 1000 or more watts may be reccomended.
It's also good to go a bit 'above', as power supplies lose 5-10% of their capacity per year (5-25% for non-80PLUS PSUs)
Beyond that, the rest is mostly gimmick and hype and does not make a considerable difference. Make sure it has enough and correct connectors, tho.
Always get a good brand PSU, they blow 80% so does your hardware.
For a Small Office Home computer around 450watts will be fine, Mediocre gaming computer around 750W
Try not to be hanging around the max, to avoid a brownout
75% is the typical efficiency rating for a power supply 75% is the typical efficiency rating for a power supply
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300Watts for low end and 950Watts for high end
Computers
SMPS
it can simply be called a "power supply" or a PSU (power supply unit)
You need to make sure you buy a power supply that is rated for your motherboard. Common ratings are 350w, 400w and 500w.
Molex and Sata
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Computers require their own internal power supply because the power required to power most newer computers, especially with high-end graphics cards, would require a bulky power supply which wouldn't be ideal in transporting computers or aesthetically. Also, with all of the other internal parts of a computer, some type of power interface would be necessary within the PC anyway, so why not just bundle it all together?
The first power supply was invented by Thomas Edison. It is unknown when exactly the first universal power supply for computers was invented.
All computers have an internal power supply... An external one is simply for back up if you lose power.
A power supply that is designed to be outside the case of the computer. Most laptop computers use an external power supply rather than an internal one to reduce size and weight while the laptop runs on battery power.
there are how many computers you can get connected to