Ohm's Law describes the relationship among which electrical quantities?

• A. Voltage, current, and resistance.
• B. Power, energy, and charge.
• C. Capacitance, inductance, and resistance.
• D. Frequency, impedance, and phase.

Answer: (A)

Ohm's Law shows how voltage, current, and resistance are connected. The rule states that the voltage across a conductor equals the current through it times its resistance, written as V = I R. This means that with a fixed resistance, current and voltage rise or fall together proportionally; if resistance changes, current and voltage adjust so the product I R remains equal to V. The basic quantities are volts for voltage, amperes for current, and ohms for resistance. Other groupings describe different ideas—power and energy involve P = V I and energy over time, while capacitance/inductance relate to reactive properties that come into play in AC analysis through impedance and phase rather than the simple DC relation.