According to Ohm's law, the current in a circuit is equal to which of the following?

• A. I = V/R
• B. I = V*R
• C. I = R/V
• D. I = P/V

Answer: (A)

Current in a circuit is determined by how strongly the electrical push is (voltage) and how much the path resists the flow (resistance). Ohm’s law gives the direct relation I = V/R, meaning the current is the voltage divided by the resistance. The units align: volts divided by ohms equals amperes.

This makes intuitive sense: increasing voltage with the same resistance pushes more charge per unit time, increasing current; increasing resistance with the same voltage reduces the current.

Other forms don’t reflect the direct Ohm’s law relationship. I = V×R would mix the quantities in a way that doesn’t yield current in amperes. I = R/V is the reciprocal and would imply the opposite dependence on voltage. I = P/V comes from the power relationship P = VI and is not the basic way Ohm’s law expresses current in terms of voltage and resistance.