Physics Review Question

Unit: Electricity
Year: 1989 Question#: 57
Question: As the resistance of a constant-voltage circuit is increased, the power developed in the circuit

(1 ) decreases
(2 ) increases
(3 ) remains the same

What is this question really asking?



Explanation by: Anna R

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Answer 1
decreases

CORRECT
The formula for power is P=v2/R, so if the resistance (R) is increased, the power would decrease.

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Answer 2
increases
INCORRECT

The formula for power is P=v2/R, so if the resistance (R) is increased... try again.

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Answer 3
remains the same

INCORRECT

The formula for power is P=v2/R, so if the resistance (R) is increased... try again.

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What's this question really asking?

Do you know how to find and manipulate the formula for power given info about voltage and resistance? return to tops for Technology i