If voltage increases while resistance remains the same, what happens to current?

• A. Current increases
• B. Current stays the same
• C. Current decreases
• D. Current becomes zero

Answer: (A)

Ohm's law shows how current relates to voltage and resistance: I = V / R. When the resistance stays the same and you raise the voltage, the current must rise in proportion to the increase in voltage. In other words, more voltage pushes more charge through the same obstacle each second, so doubling the voltage doubles the current, tripling it triples the current, and so on. The other possibilities would require changing the resistance or removing the path for current, but with a constant resistance, increasing voltage cannot leave the current unchanged, decrease it, or drop it to zero.