Which quantities does Ohm's Law relate?

• A. Voltage, current, and resistance.
• B. Pressure, volume, and temperature.
• C. Mass, velocity, and acceleration.
• D. Power, energy, and time.

Answer: (A)

Voltage, current, and resistance are linked by Ohm's Law. It states V = I × R, meaning the electric pressure (voltage) drives an electron flow (current) through a material that offers opposition (resistance). For a fixed resistance, increasing voltage increases current proportionally; for a fixed voltage, increasing resistance reduces current. You can find any one of the three if you know the other two, using I = V / R, V = I × R, or R = V / I. For example, with a 12-volt source across a 6-ohm resistor, the current is I = 12 / 6 = 2 A. The other options describe quantities from different domains (thermodynamics, mechanics, or energy progression) and aren’t part of this fundamental relationship.