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高二物理电磁学，变压器的由来？
1831年法拉第制作了一个环形铁芯，在铁芯上绕上原线圈，且给这个线圈通变化的电流，就在铁芯中激发变化的磁场；然后在铁芯上再绕上副线圈且闭合，副线圈匝数多、电压高，匝数少、电压低！1891年人们把这个装置创新为变压器！
高二物理实验17/122
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