If I am powering a 24V light that requires 0.5A using a 24Vdc power supply, how much of a voltage drop is there if I'm using 22AWG (0.33mm^2) copper wire for 100 meters? Google says copper has a resistivity of 1.68e-8.

What do you think about this calculation on this Redarc website: LINK

I'm not sure why their calculation is using 0.017 rather than 1.68e-8.

Can someone give me an intuitive explanation and relate it to ohms law?