What exactly does Ohm's Law explain? Isn't it all of the above??

Question

What exactly does Ohm's Law explain?

a) Current is proportional to voltage

b) With higher voltage, there is greater force, therefore the molecules will move faster

c) If resistance is held constant, the current increases, therefore the molecules move faster

d) All of the above

Answer 1

Ohm's law is typically written as E = IR where E is the voltage, I is the current, and R is the resistance. Rearranged, I = E/R where now the proportionality constant is 1/R; so, this shows the current is proportional to the voltage. Answer a is the only correct answer. Incidentally, 1/R is called the conductance.