Ohm's law: Which expression equals voltage?

Ohm's law: Which expression equals voltage?

• A. P x R
• B. I / R
• C. I x R
• D. I x P

Answer: (C)

Voltage is the electrical potential difference that drives current, and Ohm's law expresses it as V = I × R. If you know the current through a resistor and its resistance, multiplying them gives the voltage in volts. The units line up: amperes times ohms equals volts. Among the options, multiplying current by resistance directly yields voltage. The other expressions don’t represent voltage: P × R combines power with resistance, I ÷ R gives conductance (siemens), and I × P combines current with power, not voltage.

Voltage is the electrical potential difference that drives current, and Ohm's law expresses it as V = I × R. If you know the current through a resistor and its resistance, multiplying them gives the voltage in volts. The units line up: amperes times ohms equals volts. Among the options, multiplying current by resistance directly yields voltage. The other expressions don’t represent voltage: P × R combines power with resistance, I ÷ R gives conductance (siemens), and I × P combines current with power, not voltage.