If a resistance to which a constant voltage...

Question 1 of 270702bWEObLsSnnp2Q9dIG1W

If a resistance to which a constant voltage is applied is halved, what power dissipation will result?

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Question 1 of 27070

Q

If a resistance to which a constant voltage is applied is halved, what power dissipation will result?

🔍 Key Concepts

• Relationship between power, voltage, and resistance in DC circuits • Difference between formulas P = V × I and P = V² / R • What happens to current when resistance changes but voltage stays constant

💭 Think About

• Which power formula is best to use when voltage is held constant and resistance is changing? • If you halve the resistance and keep the same voltage, what happens to the current in the circuit? Then how does that affect power? • Try writing out the power expression before and after the resistance is halved, then compare the two results.

✅ Before You Answer

• Make sure you are using the formula that includes voltage and resistance directly (not the one with current and resistance). • Carefully substitute R and then R/2 into the same power formula and simplify. • Check whether the final power is a fraction or a multiple of the original power; that tells you which choice (doubled, halved, tripled, same) is correct.