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。

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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。

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Creating a magnetic field using electricity is easy: an electric current flowing in a wire generates a magnetic field around that wire.

ECONOMIST: Recreating the planet's magnetic field in a laboratory