I have a 12v DC switching power supply driving LED strips via MOSFET's. Power supply is 6A. My ACS712 and Fluke register 1.26A when the strip is on.
At zero load the PS puts out 12.87v. With 1.26A load on it drops to 12.67. Not a huge drop. If I build a voltage divider to drop it to 5V so I can monitor it on my uC, do I base the resistors on the loaded or unloaded volts? Seems like a moving target.