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In most of North America, the mains supply to the home is 120 volts. The

current through a device dissipating 40 watts is 40/120 = 1/3 Ampere.

In most of the rest of the world, the mains supply to the home is 220 volts.

The current through a device dissipating 40 watts is 40/220 = 0.18 Ampere.

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