I found out way back in the early 80's when I tripped over a power cord at the Auto Parts Store and unplugged the CPU. I hurriedly plugged it back in and promptly FRIED THE ENTIRE CPU !!!
This was a DATA GENERAL SYSTEM.
It was only running 1 Store, 4 Terminals and 2 Printers. A fixed 10mb HDD Platter and 1 removable 10mb HDD Platter, 2 8" Soft Floppy Disk Drives and I don't remember the Memory but it was stupidly low in size.
Good thing it was all insured.