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Joule Heating: Resistance vs. Temperature
For some reason, your laptop charger gets super hot when you plug it in.
It had recently stopped working, and so you left it with a friend who claimed to know how to fix it. He said that all he’d need to do would be to swap out a broken resistor with a replacement—but he also mentioned that he replaced the charger’s resistor with a resistor with a lower value of resistance. His reasoning was that it would make your laptop charge faster. For this same reason, he also cranked up the voltage that travels through the charger, and now you’re sitting home with a laptop charger that feels like it could burn a hole through your couch.
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