The resistance affects the dropout voltage it per all of the resistors in parallel, parallel with the same voltage. And measuring the wrong polarity on DC power supply is always negative.
The resistance affects the voltage drop across it. Shunt resistor in parallel with all the pressure as well. And measuring the polarization of the DC power supply which is always negative.
Resistance pressure drop on him. On the parallel resistors, all parallel pressure are equal. Wrong polarity in the DC power supply and the measurement values to be negative.