A transformer in an electric circuit serves to （）<br>A:generate its own electrical power<br>B:transform electrical energy into mechanical energy<br>C:increase or decrease circuit voltage as required<br>D:convert AC current to DC current

A transformer in an electric circuit serves to （）
A:generate its own electrical power
B:transform electrical energy into mechanical energy
C:increase or decrease circuit voltage as required
D:convert AC current to DC current

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