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/diy/ - Do-It-Yourself


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>> No.1607987 [View]
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Okay I know this is a retarded question but I don't know jack about electronics so bear with me.
After reading about Ohm's law I was left with the impression that the voltage is always equal to the resistance times the current. However, I own several phone chargers; one is rated at 5V/1.5A, another is rated at 5V/2.1A and and another is rated at 5V/1A. I can use the same USB cable to connect each charger to my phone. Since the voltage and resistance of the cable remain constant, how can the amperage change? Do smartphones have some built-in dynamic resistor that can adjust the resistance to match the rating of the charger?? If that's the case, does it have a technical name I can look up to find out how it works

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