According to Ohm's Law, voltage equals what?

• A. The current divided by resistance
• B. The product of current and resistance
• C. The ratio of resistance to current
• D. The sum of current and resistance

Answer: (B)

Ohm's Law shows how voltage, current, and resistance relate to one another. Voltage is the electrical potential difference that pushes current through a circuit, and it equals the current multiplied by the resistance: V = I × R. This product form means that if you know how much current is flowing and how much opposition (resistance) the circuit offers, multiplying those two values gives the voltage. For example, 2 A through 3 Ω yields 6 V. The other expressions don’t describe voltage: dividing current by resistance gives a quantity with different units (conductance), the ratio of resistance to current isn’t voltage, and simply adding current and resistance isn’t part of Ohm’s Law.