Which statement correctly represents Ohm's Law relating voltage, current, and resistance?

Which statement correctly represents Ohm's Law relating voltage, current, and resistance?

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

Answer: (B)

Voltage, current, and resistance are linked by a simple rule: the voltage across a conductor equals the current through it multiplied by its resistance. In symbols, V = IR. This form cleanly shows how each quantity affects the others: if you know the current and the resistance, you can find the voltage; if you know voltage and resistance, you can find the current. Units line up nicely: volts come from multiplying amperes by ohms (1 V = 1 A × 1 Ω). For example, 2 A flowing through a 5 Ω resistor produces 10 V. Rearrangements like I = V/R or R = V/I express the same relationship from different starting quantities, but the direct statement relating all three quantities is V = IR. P = VI is a separate relation that gives electrical power, not the three-variable Ohm’s law itself.

Voltage, current, and resistance are linked by a simple rule: the voltage across a conductor equals the current through it multiplied by its resistance. In symbols, V = IR. This form cleanly shows how each quantity affects the others: if you know the current and the resistance, you can find the voltage; if you know voltage and resistance, you can find the current.

Units line up nicely: volts come from multiplying amperes by ohms (1 V = 1 A × 1 Ω). For example, 2 A flowing through a 5 Ω resistor produces 10 V.

Rearrangements like I = V/R or R = V/I express the same relationship from different starting quantities, but the direct statement relating all three quantities is V = IR. P = VI is a separate relation that gives electrical power, not the three-variable Ohm’s law itself.