Question

1. Investigate Ohm’s law for reverse currents in resistors. Turn off the power supply and reverse the connections on the power supply. Turn the power supply back on and take data from 5.0 V to 0 V. Do not stop data collection. Turn off the power supply, restore the connections to the circuit to their original configuration, and turn the power supply back on. Take data from 0 to 5 V as before. Is the current still proportional to the potential across the resistor? Explain.

Answer 1

Please see below as the answer is self-explanatory.

Step-by-step explanation:

Reversing the power supply connections to a resistor, that is directly attached to it, just inverts the direction of the current through it (as it always flows from the higher potential to lower one) but the Ohm's law remains valid, in the sense that the current through a resistor is proportional to the voltage between its terminals, being the proportionality constant the resistance of the device, as follows:

V = I*R