No. You need to rewire the circuit from the electric panel.
You tell yourself the 125 volt receptacle is a 120 volt receptacle. They're the same thing.
No. To prevent this sort of thing from happening, the 277 volt device and receptacle is physically larger that a 240 volt receptacle and will not fit in a regular receptacle junction box. For a 277 volt system the proper size junction boxes have to be purchased.
Yes, the rating on the receptacle is the maximum amount of voltage that is legally allowed to be applied to the device.
That appliance might last longer if you use an eight volt adapter rather than a nine volt adapter.
An adapter can be used. Make sure that the adapter that you use is of a capacity that it can produce the amperage that your appliance needs. An adapter too small will burn itself open and will be of no use to anyone. Remember; Watts = Amps x Volts.
No
Not directly. Maybe with a proper adapter. Even if the TV plug fits into the receptacle (it shouldn't), the TV would not work and could possibly overheat or cause a fire, or be damaged internally.
No, of course not. The 6v adapter only produces 6v, while the load expects 9v.
No. an AC adapter will not work for equipment that needs DC.
It sounds like the same thing to me.
Yes, a 110 volt device can be plugged into a 125 volt receptacle. The voltage rating on the receptacle is only there as the highest voltage supply that the manufacturer recommends their equipment be connected to.
No, the electrical insulation rating of a 15 amp duplex receptacle is only rated at 130 volts. The 15 amp 240 volt receptacle is rated at 250 volts. The 240 volt receptacle also has a tandem pin configuration instead of the parallel configuration of the 120 volt device. The different pin configuration is so that a 120 volt electrical device can not be plugged into a 240 voltage receptacle.