How much current will an electric heater 1kw draw when connected to 25w
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However, if that heater is rated at 1kw at a different voltage, then it’s impossible to answer without that information. Even then, it would only be possible to estimate as resistance tends to increase with temperature. If the resistance remained constant, then if the voltage is only 90% of the rated, it will only produce 81% of the rated heat output. However, as the resistance will be somewhat less as the heater elements will be cooler, that will partly compensate, so it might produce (say 85%) of the rated output.
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