The electro-magnetic microgenerator utilizes a moving magnet or coil for inducing an alternating electric current in a circuit.

微型磁发器以移动的磁铁或线圈，在路制造出感应交流。

AC Milliammeter, Model J0414, is suitable for the laboratories of middle schools and polytechnic schools to measure current intensity in the AC circuit.

J0414型交流毫安表适用于学、专等实验室测量交流路的流强度。

The result shows that CJD alternating current electrodynamometer has simple structure and the energy feedback efficiency can reach 74%, with outstanding energy-saving effect, good control stability.

运行结果表明，该CJD交流力测功机控制性稳定，可靠性好，果显著，量反馈率最高可达到74%。