Ohm's Law states the current that flows through a component is directly proportional to the voltage across the component.

Ohm's Law states the current that flows through a component is directly proportional to the voltage across the component.

• A. Current is directly proportional to voltage
• B. Voltage is directly proportional to resistance
• C. Power is inversely proportional to current
• D. Resistance is proportional to voltage squared

Answer: (A)

The key idea is the linear link between current and voltage for a resistor: I = V/R. When the resistance is fixed, increasing the voltage across the component causes a proportional increase in current, so current is directly proportional to voltage. The constant of proportionality is 1/R, meaning doubling the voltage doubles the current if the resistance stays the same. This makes the stated idea the best description of Ohm’s Law in this form. The other statements don’t reflect how the variables relate in a simple resistor: voltage isn’t determined solely by resistance, power does not decrease with current, and resistance isn’t generally proportional to voltage squared for a Ohmic device. Non-ohmic components can have different, non-linear relationships, but for a resistor with constant resistance, the direct proportionality between current and voltage is the correct takeaway.

The key idea is the linear link between current and voltage for a resistor: I = V/R. When the resistance is fixed, increasing the voltage across the component causes a proportional increase in current, so current is directly proportional to voltage. The constant of proportionality is 1/R, meaning doubling the voltage doubles the current if the resistance stays the same.

This makes the stated idea the best description of Ohm’s Law in this form. The other statements don’t reflect how the variables relate in a simple resistor: voltage isn’t determined solely by resistance, power does not decrease with current, and resistance isn’t generally proportional to voltage squared for a Ohmic device. Non-ohmic components can have different, non-linear relationships, but for a resistor with constant resistance, the direct proportionality between current and voltage is the correct takeaway.