A device used to transfer electric energy from one circuit to another, especially a pair of multiply wound, inductively coupled wire coils that effect such a transfer with a change in voltage, current, phase, or other electric characteristic.

• 变压器一种把电能从一个电位转移到另一个电位的装置。尤指一对多组缠绕在一起且互相感应的配对电线圈，通过电压、电流、相位或其它的电特性改变产生这样一种电能的转换