In a simple Ohm's law scenario, if voltage is constant and resistance increases, what happens to current?

• A. Current increases
• B. Current remains the same
• C. Current drops to zero
• D. Current decreases

Answer: (D)

With a constant voltage, current follows I = V/R. If you keep the voltage the same and increase the resistance, the denominator gets larger, so the current must shrink. For example, 10 V across 5 Ω yields 2 A, while 10 V across 20 Ω yields 0.5 A. Current is inversely related to resistance, so it decreases as resistance rises; as resistance grows very large, the current approaches zero (but isn’t exactly zero for finite resistance). Therefore, current decreases.