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Nov19-12, 10:29 AM
Sci Advisor
P: 2,470
For starters, rating for some devices is approximate. Cheap submersible water heaters, for example, can easily be 10%-20% off. But generally, a device that operates properly should not consume more power than it is rated for. A malfunction, however, can easily cause a device to consume a lot more. Short circuit being the simplest example.