A good power supply plays a fundamental part in the stability and reliability of desktop computers. Corsair, Seasonic and Antec each manufacture high quality power supplies.
One can get a backup power supply from the following sources: Special List Power, DC Response, Newegg, Office Max, Wholesale Solar, Cyber Power, Eco Power Supplies.
The motherboard does not connect the power supply to the peripherals. The power is supplied directly to most peripherals such as HDDs and CD drives by cables from the power supply. Some special expansion cards, such as network cards, get enough power from the motherboard through the PCI slot to function.
A regulated power supply
No special power adapter is needed, because each device, is charged by it's own adapter. If laptops and desktops are connected by a wireless router, for example, the router will have it's own power adapter. However, to establish a wireless connection with a desktop , a laptop must have a wireless USB Wi-Fi adapter. This particular adapter has nothing to do with powering the device. It simply transmits signals to connect with a desktop, another laptop, PDA, cell phone, etc.
Lenovo laptops do sell desktops. These desktops are very reliable and works quite fast. Another great thing about the Lenovo desktops are that they are very eco-friendly and have great power usage.
It is a switching regulator.
While the fastest computers currently on the market are desktops, laptops can rival 95% of the world's desktops in processing power and overall speed.
SMPS [Switch Mode Power Supply ] also known as PSU [Power Supply Unit] is used in desktops to convert AC TO DC and to divide voltage to appropriate units to different components.... Since Laptops has a adapter [which does the job] which comes with the charger a seperate smps is not needed........ or Its included in the package..to be more clear yes laptops need smps
UPS = Uninterruptible Power Supply
power supply is a device that supplies electric power to electrical load
all about regulated power supply
Advantage of regulated power supply.