The current through a component is directly proportional to the voltage across it. Which statement describes this aspect of Ohm's Law?

The current through a component is directly proportional to the voltage across it. Which statement describes this aspect of Ohm's Law?

• A. I ∝ V
• B. V ∝ I^2
• C. I ∝ R
• D. V ∝ P

Answer: (A)

Ohm's law shows that current through a component is directly proportional to the voltage across it when the resistance stays the same. Write V = IR, so rearranging gives I = V/R. If R is constant, doubling the voltage doubles the current, which is exactly what a direct proportionality I ∝ V means. The constant of proportionality is 1/R, linking how easily current flows to the resistance present. This is why the statement I ∝ V correctly describes this aspect of Ohm's law. If you see a different relationship, like V ∝ I^2 or I ∝ R, those don’t describe the straightforward, linear link between voltage and current for a fixed resistor. And V ∝ P isn’t the basic Ohm's-law relationship either, since power involves both voltage and current (P = VI).

Ohm's law shows that current through a component is directly proportional to the voltage across it when the resistance stays the same. Write V = IR, so rearranging gives I = V/R. If R is constant, doubling the voltage doubles the current, which is exactly what a direct proportionality I ∝ V means. The constant of proportionality is 1/R, linking how easily current flows to the resistance present.

This is why the statement I ∝ V correctly describes this aspect of Ohm's law. If you see a different relationship, like V ∝ I^2 or I ∝ R, those don’t describe the straightforward, linear link between voltage and current for a fixed resistor. And V ∝ P isn’t the basic Ohm's-law relationship either, since power involves both voltage and current (P = VI).