Aincreases or decreases voltage in a power line1). motor2). generator3). ammeter4). transformer

The correct answer is 4.

Explanation:

A transformer is an electrical element that allows increasing or decreasing the voltage in an alternating current electrical circuit, maintaining the power that enters the equipment, in the case of an ideal transformer, constant at the output. Basically, it converts the alternating electric energy of a certain voltage level into alternating energy of another voltage level, based on the phenomenon of electromagnetic induction.

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resonant frequency

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