Yes, otherwise it will be useless when the battery runs out.
Yes
If a computer's power supply overheats then switch the computer off and let it cool down. Similarly, purchase a laptop stand or computer fan to get cool air flowing around the machine.
The use of computer cases with power supply in them is to be able to charge a person's laptop, netbook, iPad, or other electronic device while it is in the case still.
If the power adapter isn't plugged in before the computer is powered on, then the computer will not power on. The power supply provides power to the rest of the computer (which allows it to boot). If the power supply doesn't get power, then the rest of the computer doesn't get power. This doesn't apply to a laptop if it has a charge stored in the battery.
The power supply makes the computer run, without any type of power supply it would be impossible to run a computer. The mains power supply for a laptop and the power supply unit of a desk top, both convert the high AC voltage from the mains power and convert it to low voltage DC, for the electronics of a computer to use.
In order to supply power supply to your computer you would need an outlet plug near your computer. Then you can plug your computer into that and necessarily, use an extension.
A power supply gives electrical power to all the components and parts of the computer. The power supply consists on several wires that connect to specific parts of the computer. Examples are the IDE/SATA CD/DVD Drive, IDE/SATA Hard Disk Drive, the motherboard, etc. Power supplies are only a computer part in a desktop computer, NOT a laptop computer.
In the case of a desktop computer a power supply that in turn plugs into a household outlet provides power to the internal components of the computer. In the case of a laptop or tablet a battery provides power.
Many situations may lead a user to search for a generic laptop power supply. The original power supply may have become ineffective or may have been lost during travel. Laptop power supplies are the connection between the laptop and a power source. This cable is used to recharge the batteries that are a component of the notebook. Regardless of the reason for replacement, the user must decide whether to buy a name brand power supply or go with a generic manufacturer.
Your computer can run as long as there is a power supply. As long as the power is on you should have no problem
A laptop.
If you have a laptop, it should say on the underside either on the batter cover, or on the battery itself. For a desktop computer, it might say on a sticker above the power socket. If not, you'll need to open up your computer and have a look on the PSU (Power Supply Unit). This is located adjacent to the power socket.