Your internal computer components are very sensitive. If powered with strong, unregulated current, they can easily get damaged. Thus, you should choose your power supply unit carefully when you are building your own computer.
The power supply unit, called PSU for short, is the computer hardware that converts raw electrical current from the power line into voltages that are safe for your internal computer components. Without a PSU, your internal computer components will get fried in no time.
Because it is the computer hardware that is responsible for keeping your computer powered up, never get a low-budget, low-quality PSU. Always be ready to pay for quality. If your PSU malfunctions if even for a moment, it can destroy a number of your internal computer components. Your motherboard, processor, RAM modules, video card, and other components can and can be easily short-circuited if subjected to strong, unregulated current.
Thus, when you are assembling your own computer and choosing a PSU, stick with brand name models with a proven track record. You can read consumer reviews about the PSUs that you have shortlisted to help you decide.
If you see a very affordable and seemingly powerful solution from an uncommon brand, it is best to be wary. Many cheap PSUs have inflated power ratings. If you get these units, you will put all of your vital computer components at risk of improper voltage and an early demise.
It is important that you do not overtax your PSU once you have finished building your own computer. Severe electrical swings can greatly reduce its lifespan. The PSU will also not be able to handle the surge of electrical power coming from a lightning strike. To protect your investment, use an uninterruptible power supply or UPS. The UPS will make sure that your PSU receives a steady stream of regular voltages.
Also take into consideration the power requirements of your computer hardware when selecting your PSU. High-end computer components require more power. If you are building a gaming computer, it is best to have a PSU with a power rating of at least 500 watts.