The user must supply the coil current for the external relays.

用户必须为外部继电器提供线圈电流。

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The sensor and the transmitter's electronic coil are powered by external magnetic energy.

传感器和发送器的电子线圈由外部磁场能量供电。

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The improved coil device has the advantages of convenient connection, external connection line saving and better security.

本实用新型具有接线方便、可节省外接线和安全性较好的优点。

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Instead, the coil is pulled through the external magnetic field, which induces a voltage across it.

ECONOMIST: Weighing a kilogram

The coil is suspended in an external magnetic field and the current running through it adjusted so that the attraction between the two magnets balances the gravitational force on the suspended mass.

ECONOMIST: Weighing a kilogram