Which statement correctly describes current using Ohm's law when voltage and resistance are known?

Which statement correctly describes current using Ohm's law when voltage and resistance are known?

• A. Current equals voltage divided by resistance
• B. Current equals resistance divided by voltage
• C. Current equals voltage times resistance
• D. Current is independent of voltage and resistance

Answer: (A)

Tracking how current changes with voltage and resistance is the essence of Ohm's law: current is the result of voltage across a conductor divided by its resistance. So when voltage and resistance are known, the current is calculated as current = voltage / resistance. This means increasing voltage increases current, while increasing resistance decreases current; doubling the voltage doubles the current, and doubling the resistance halves the current. For example, 10 V across 5 Ω yields 2 A. The other forms—resistance divided by voltage or voltage times resistance—do not fit the relationship and would give incorrect units or dependence. Likewise, current is not independent of voltage and resistance.

Tracking how current changes with voltage and resistance is the essence of Ohm's law: current is the result of voltage across a conductor divided by its resistance. So when voltage and resistance are known, the current is calculated as current = voltage / resistance. This means increasing voltage increases current, while increasing resistance decreases current; doubling the voltage doubles the current, and doubling the resistance halves the current. For example, 10 V across 5 Ω yields 2 A. The other forms—resistance divided by voltage or voltage times resistance—do not fit the relationship and would give incorrect units or dependence. Likewise, current is not independent of voltage and resistance.