Tuesday, 27 June 2017

voltage - Why are some electronic devices rated for volts and some current?


Why are some electronic devices rated for volts and some current? Isn't total wattage what matters? Most seem to be rated for amps, and Tesla famously ran hundreds of thousands of volts through himself, which certainly implies that current is what matters.


For instance, the Raspberry Pi's GPIO pins are 3.3V and 5V. Why are these voltage-rated and not amperage-rated?




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