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Sep 27, 2019 at 14:23 comment added K Mmmm R u saying in the 12V silver boxes the voltage might change during normal operation? Or only if u modify it?
Sep 27, 2019 at 14:15 comment added K Mmmm In the case of a laptop charger or the big silver boxes most people use, the voltage is constant during operation. The resistance is also an independent variable. Current is the dependent variable.
Sep 27, 2019 at 8:04 comment added Sean Houlihane @steveantwan absolutely not. You can adjust most modular switching supplies maybe 15%, and a DC-DC switching converter can be had for very little $. If you have a specific bed, you have a resistor. I will not have non-scientific concepts introduced into my posts.
Sep 27, 2019 at 4:15 comment added K Mmmm I would also consider the voltage to be a constant, in the case of a DC power supply. It's the current draw that changes
Sep 26, 2019 at 12:36 history answered Sean Houlihane CC BY-SA 4.0