Most have a fan in them and you can hear when it is on.
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.
any power supply with at least 175 watts
This can very greatly from computer to computer. You will have to open the case of your computer to tell.
If it is a computer power supply it is the box that gives the computer its power from the outlet.
Power amplifierPower supply regulatorSwitching power supply chopperetc.
If you have a 500 watt power supply and you want to put in a new video card. On the video card's box it will tell you how much power it needs. If it requires less power then you don't need to worry. If it says it requires more, you'll need a bigger power supply with large wattage otherwise you'll kill your computer.
To keep the power supply cool. If there were no fan the power supply would overheat and fail.
When your computer will not power on. When the cooling fan of the power supply has failed. When the amount of hardware in use in your case exceeds the power capability of your power supply.
power supply is a device that supplies electric power to electrical load