Most residential power is supplied as 240 volt. A more important factor would be how many amps the service is sized for. Most modern residential services are supplied 200 amp service, which should be...
That is a wrong question, because the house has to take the voltage, the power station is delivering. Either 120 volts in the USA or 230 volts in Europe.
Volts are never consumed.
120 volts and 240 volts. Typically 240 volts is supplied to the house electrical service entrance. It is split into it's 120 volt components via two buss bars. Hooking a circuit up to just one bar...