If a resistor has a fixed voltage across it and its current is doubled, what happens to power?

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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 a resistor has a fixed voltage across it and its current is doubled, what happens to power?

Explanation:
Power is the rate at which energy is used, given by P = VI. If the voltage across the resistor stays the same and the current doubles, the product V × I doubles as well. So the power dissipated by the resistor increases by a factor of two. This shows that with a fixed voltage, power scales directly with current.

Power is the rate at which energy is used, given by P = VI. If the voltage across the resistor stays the same and the current doubles, the product V × I doubles as well. So the power dissipated by the resistor increases by a factor of two. This shows that with a fixed voltage, power scales directly with current.

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