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Do-It-Yourself (DIY) Question & Answer Forum
Actual Power Requirement
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<blockquote data-quote="Geoff1946" data-source="post: 515165" data-attributes="member: 28452"><p>Don't worry too much about the figures. Ohms law, in its simplest form works perfectly for DC.</p><p></p><p>AC is a whole lot more complex mathematically, and using ohms law gives only a rough indication.</p><p></p><p>Add to that your power meter isn't a precision calibrated instrument, (though one I have seems quite good), and the ratings plates on things like battery chargers are also not to be relied on. </p><p></p><p>Being maximums, they will assume highest possible input voltage and maximum output current, -conditions which you probably don't have. </p></blockquote><p></p>
[QUOTE="Geoff1946, post: 515165, member: 28452"] Don't worry too much about the figures. Ohms law, in its simplest form works perfectly for DC. AC is a whole lot more complex mathematically, and using ohms law gives only a rough indication. Add to that your power meter isn't a precision calibrated instrument, (though one I have seems quite good), and the ratings plates on things like battery chargers are also not to be relied on. Being maximums, they will assume highest possible input voltage and maximum output current, -conditions which you probably don't have. [/QUOTE]
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