If the voltage across a resistor doubles while its resistance remains the same, what happens to the current?

Study for the IGCSE Physics Electricity Test. Master key concepts with flashcards and multiple choice questions, each providing hints and explanations. Prepare with confidence for your exam!

Multiple Choice

If the voltage across a resistor doubles while its resistance remains the same, what happens to the current?

Explanation:
The important idea is Ohm’s law: current through a resistor equals the voltage across it divided by its resistance, I = V/R. If the resistance stays the same and you double the voltage, the current must double as well because I = (2V)/R = 2(V/R). So the current doubles.

The important idea is Ohm’s law: current through a resistor equals the voltage across it divided by its resistance, I = V/R. If the resistance stays the same and you double the voltage, the current must double as well because I = (2V)/R = 2(V/R). So the current doubles.

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