Transformers are primarily used to change voltage and current rather than directly change energy or power.
Specifically, a transformer changes the proportionality of voltage and current by changing the turns ratio of the original and secondary coils. According to Faraday's Law of Electromagnetic Induction, the rate of change of magnetic flux in the original and secondary coils is the same, so the voltage is proportional to the number of turns and the current is inversely proportional to the number of turns. This means that if the turns ratio of the original and secondary coils is changed, the output voltage and output current can be changed.
As for energy and power, the transformer does not change them directly. Ideally, the input power of a transformer is equal to the output power, i.e., there is no loss of energy in the conversion process. However, in practice, due to the presence of resistance, magnetic leakage and other factors, the transformer will consume part of the energy, resulting in the input power being slightly greater than the output power. However, this is not a direct change in energy or power by the transformer, but it is due to losses during conversion.
Therefore, it can be said that transformers are mainly used to change voltage and current rather than directly changing energy or power.
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