A resistance across which a constant voltage...

A resistance across which a constant voltage...

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Question 1 of 20KebVVNO5OcjjJBGrGcU9

A resistance across which a constant voltage is applied is doubled. What power dissipation will result?

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Question 1 of 20

KebVVNO5OcjjJBGrGcU9

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A resistance across which a constant voltage is applied is doubled. What power dissipation will result?

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🔍 Key Concepts

• Relationship between power, voltage, and resistance • Ohm’s Law: relationship between voltage, current, and resistance • How power changes when voltage is held constant but resistance changes

💭 Think About

• Write down two power formulas that involve voltage, current, and resistance. Which one is most useful when voltage is constant? • If resistance is doubled, how does the current change when the voltage stays the same? Then, how does that affect power? • Compare the new power expression to the original one. Is it larger, smaller, or the same, and by what factor?

✅ Before You Answer

• Use the formula for power that has voltage and resistance only (no current) when voltage is constant. • Carefully square or invert any terms as needed—watch for R vs 1/R vs R² mistakes. • After doing the math, check if the result is a simple fraction or multiple of the original power that matches one of the choices.

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