SAT Subject Physics Practice Question 661: Answer and Explanation

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Question: 661

12. A constant voltage power source is in a circuit where the resistance is increased by four. The voltage in the circuit

A. increases by two.
B. increases by four.
C. decreases by two.
D. decreases by four.
E. remains the same.

Correct Answer: E


The correct answer is (E). A constant voltage source does not change, regardless of the value of the resistance added to the circuit.

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