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Most electronic equipment runs on far less that both of these voltages. Most likely from 5 to 12 volts DC. To get down to these votages it has to be processed by a transformer. Good equipment will have a switch on it so that you can chose what the input voltage will be. All this switch is doing is changing the taps on the primary side of the control transformer. The secondary side of the transformer is the working voltage of the equipment 5 to 12 volts. The secondary side of the transformer is then put through a full wave bridge rectifier to change it to DC. When you charge your cell phone this is all that you are doing when you plug it into the wall, except without the switch to select the 240 volts. The rectifier is built right into the wall PAC and out comes the voltage your cell phone is looking for.

This planet is usually running 120 ac or 220 AC That is what most of the people knows as power. There is and never will be a set of voltages that will run everything. but there are some industry standards personal computer are 3v,5v,12v ,12v. these voltages are not are set but are carefully chosen for efficiency a room heater will take forever to heat a room at 5v. so the conclusion is voltages are chosen for efficiency and nothing more then that.

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