This forces the freed electrons to travel to the second electrode through a wire, creating an electric current.
而自由电子则通过一条导线移动至第二电极，从而产生电流。
Creating a magnetic field using electricity is easy: an electric current flowing in a wire generates a magnetic field around that wire.
用电流产生磁场容易：当电流在金属线圈流动时，磁场也随之产生。
Creating a magnetic field using electricity is easy: an electric current flowing in a wire generates a magnetic field around that wire.
用电流产生磁场容易：当电流在金属线圈流动时，磁场也随之产生。
应用推荐