If a circuit's voltage remains constant but resistance increases, what happens to current?

• A. Decreases
• B. Increases
• C. Stays the same
• D. Oscillates

Answer: (A)

When the voltage is fixed, current follows I = V/R, so it changes inversely with resistance. As resistance increases, the same voltage pushes fewer charges per second, so the current decreases. For example, with 12 volts, raising resistance from 6 Ω to 12 Ω cuts current from 2 A to 1 A; increasing to 24 Ω lowers it to 0.5 A. The other options don’t fit because higher resistance can’t cause more current, a constant current requires either constant R or a changing voltage, and oscillation would mean a varying voltage or reactive elements, not a simple rise in resistance with a steady voltage.