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The 120V appliance will take twice as much current as the 240V one. The frequency (50Hz or 60 Hz) is irrelevant unless a synchronous motor is involved; even then the difference is small. Note. a motor-driven clock, or anything similar like a time switch will tell you the wrong time, and the error will get progressively worse.

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15y ago
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Q: What is the conversion to calculate an appliances amperage draw from 240V50Hz to 120V60Hz?
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