Power surges are one of the most feared incidents on electronic devices. Same as a computer, they are really susceptible to power surges. Even though surges usually last only milliseconds (and are somewhat filtered by the transformer in the power supply), that high voltage can exceed the withstanded voltage of the insulating layers inside the integrated circuit chips and burn everything inside your computer.
The power delivered to your electronics devices and computer is stable and constant, in theory of course. In real life, it doesn't work that way. Often power surge occurs when the normal flow of electricity is interrupted, and then started again, or there was an occurrence that something sends excess electrical energy into the system. Any number of events, from lightning strikes to power failures, can cause power surges. Even your own electrical devices and computer can cause them. Refrigerators and air conditioners, for example, have motors that turn on and off, diverting electricity to and from other appliances and producing low-level power surges. On computer, internal peripheral can cause small surges that can reduced your computer lifespan or even destroy it completely.