12 volts
14 volts
12 volts...max 13.8 volts
In the United States toasters run on 120 volts.
240 volts
12 volts DC.
No less then 13.8 and no more then 14.2 Volts with engine running.
As many as will fit. The limit is usually determined by other factors, such as how many amps or watts are required rather than how many volts.
208 to 240 volts depending on your local power supply.
Yes, if the appliance was designed to run on 210 to 240 volts.
It is probably not rated to run at six volts. Check the labelling.
Assuming you mean 12 volts, then you cannot run any 78 Amp fans. Unless your fans run at 0.38 volts, there is no way to draw 78 amps from 30 watts.