In a DC circuit, if the voltage increases while resistance remains constant, what happens to the current?

In a DC circuit, if the voltage increases while resistance remains constant, what happens to the current?

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

Answer: (C)

Current in a DC circuit with a fixed resistance follows Ohm’s law: I = V / R. When the resistance stays the same, any increase in voltage directly increases the current because the same obstacle is being overcome by a larger driving force. For example, with a 10-ohm resistor, raising voltage from 5 V to 10 V makes current go from 0.5 A to 1 A. The resistance sets how much opposition there is, and increasing the voltage increases the flow of charge accordingly. So the current increases.

Current in a DC circuit with a fixed resistance follows Ohm’s law: I = V / R. When the resistance stays the same, any increase in voltage directly increases the current because the same obstacle is being overcome by a larger driving force. For example, with a 10-ohm resistor, raising voltage from 5 V to 10 V makes current go from 0.5 A to 1 A. The resistance sets how much opposition there is, and increasing the voltage increases the flow of charge accordingly. So the current increases.