SAT Subject Physics Practice Question 626: Answer and Explanation

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Question: 626

7. The purpose of a transformer is to do which of the following?

A. Change voltage
B. Reduce resistance
C. Decrease heat transfer
D. Increase magnetic fields
E. Reverse current flow

Correct Answer: A


The correct answer is (A). Transformers are used to change voltages to a form that is usable for specific applications. For example, an electrical line voltage of 1800 V is reduced by a transformer to the voltage we use in our homes.

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