关于电和磁,以下说法正确的是
A.电动机工作时是将机械能转化为电能
B.发电机工作原理是利用电流的磁效应
C.电磁继电器的主要部件是电磁铁
D.奥斯特是发现电和磁联系的第一人
第1题:

第2题:
关于直流电动机和发电机的几种说法中,不正确的是() Among several statements about DC motor and generator, the incorrect one is ()
A.电动机是把机械能转化为电能的装置A motor is a device that converts mechanical energy into electrical energy
B.电动机是利用通电线圈在磁场中转动的原理工作的The motor works on the principle that the current-carrying coil rotates in the magnetic field
C.发电机是把机械能转化为电能的装置A generator is a device that converts mechanical energy into electrical energy
D.发电机是利用电磁感应原理工作的 The generator works on the principle of electromagnetic induction
第3题:
2、一台电机将机械能转化为电能,其电机工作状态是?
A.发电机
B.电动机
C.变压器
D.不确定
第4题:
第5题:
下列说法错误的是()
A.奥斯特发现了“电能生磁”Oster discovered "electricity generates magnetism"#B.电动机的工作原理是通电线圈在磁场中受力转动The working principle of the motor is that the current-carrying coil is forced to rotate in the magnetic field#C.电动机工作时将电能转化为机械能the motor can convert electric energy into mechanical energy#D.电动机和发电机的实质是一样的The essence of electric motor and generator is the same