If the voltage doubles while resistance remains constant, what happens to the current?

If the voltage doubles while resistance remains constant, what happens to the current?

• A. It doubles
• B. It halves
• C. It quadruples
• D. It stays the same

Answer: (A)

In circuits, current is proportional to voltage when resistance is constant. This comes from Ohm’s law, I = V/R. If the resistance stays the same and the voltage doubles, the current must double as well because I scales directly with V when R is fixed. For example, if the voltage goes from 6 V to 12 V with the same resistance, the current goes from 2 A to 4 A. So the current doubles.

In circuits, current is proportional to voltage when resistance is constant. This comes from Ohm’s law, I = V/R. If the resistance stays the same and the voltage doubles, the current must double as well because I scales directly with V when R is fixed. For example, if the voltage goes from 6 V to 12 V with the same resistance, the current goes from 2 A to 4 A. So the current doubles.