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A step up transformer is used to:

1. increase the current and increase the voltage
2. decrease the current and increase the voltage
3. increase the current and decrease the voltage
4. decrease the current and decrease the voltage

Correct answer: decrease the current and increase the voltage

Solution

A step-up transformer increases the secondary voltage relative to the primary. For an ideal transformer, power is approximately conserved, so when voltage increases, current decreases correspondingly.

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