If there is too much current traveling over an extension cord or a cord for a kettle, then that thing can melt. High wattage means it is moving either some combination of current and watts. A space heater is going to take 1500 watts. So if you're wiring in your house can handle 18, sorry, 15 amps, but your extension cord might have bought at the dollar store and it can't handle 15 amps.

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