what homes? average homes, support up to 6000W, even more, depending on the country/city/house. Maybe i miss understood you
The power to a home going into a fuse box and split out into different circuits with individual fuse control on each circuit. In USA, normal, mundane plugs are on a 2400 W ( 120V 20 amp) circuit with other stuff. Limiting a single plug usage to less than 63% of that is a reasonable safety rule of thumb. So if are in a built in 1950-1970's house the multiple sockets in a room (and overhead lights) may all be on the same single circuit. A circuit may span multiple rooms where sizable electrical appliances are not the norm. (e.g. a repurposed bedroom into a 'working' den. ). Depending upon routing needed to other rooms one room may have one set of sockets on one circuit and a farther wall on a circuit shared with another room. Depends upon the layout. An electric stove ( a 220V feed) , electric drier , furnace , etc. would be on their own individual circuits with little to no circuit sharing.. All of that aggregates up to 6000W , but that doesn't mean you can point all of the house feed into some random socket in a random room in a dwelling.
If know want to plug a single highly abnormal power draw to a single socket in a specific room and can modify the fuse box then can run a single line out to a single socket.
If only 1500W is supported...you turn 1 high end PC +1 1200BTU AC and you are done
15 100W light bulbs would not be needed to light up a classic norm sized room (or two). (pre-era of the open floor plan mania and mega size houses. ) . It is a highly abnormal amount of power for a normal room (or set of smallish rooms) .