Uploaded January 2021 | Updated September 2026, 1 hour ago

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Testing a 12V 800W water heating element. These are great to use for resistive loads. When doing an Ohm's Law calculation you can determine how much resistance should be in the element. This is 12 volts, 800 watts, which should draw 66.7 amps. But in my testing I was only drawing 150 watts. What happened?

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