The power the EP500 needs doesn't change ... double the voltage then you'll need to halve the current.
Is the current halved because the power doesn't change or is the current halved because the equivalent input impedance is quadrupled?
Home wiring is only allowed to carry so much current for a certain wire size (for safety). For the same wire size doubling the voltage (i.e. only changing one variable, in this case voltage) gives you double the power. Now, if you want to change both current (wire size) and voltage ... which is valid in that standard receptacles are available for a number of voltages and amperages ... going from a 15A 120V outlet to a 30A 240V outlet will give you 4x the power.
True dat.
