SAT Subject Physics Practice Question 672: Answer and Explanation

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Question: 672

8. A step-down transformer has a coil ratio of 1.5 to 17. The voltage applied at the primary side of the transformer is 136 V. What is the output voltage of the transformer?

A. 1.2 V
B. 1.5 V
C. 5.25 V
D. 12 V
E. 18.75 V

Correct Answer: D

Explanation:

The correct answer is (D). The transformer reduces the voltage when the number of coils of wire on the secondary side is less than the number of coils of wire on the secondary side. The voltage output is found:

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