0 a device made from a piece of iron that becomes magnetic when a changing current is passed through the wire that goes around it -- 電磁鐵；電磁體
A current to the electromagnet was supplied by a battery and was changed with a variable resistance.
An electromagnet was used in order to produce a magnetic field.
This consists of an electromagnet that deflects electrons away from the axis.
At the top of the columns an electromagnet is attached holding up a screen.
Only when the current of the electromagnet is broken does the card become visible through an opening in the screen.
But the functioning electromagnet necessitates the existence of the field.
To increase the torque transmission capacity, another shear disk is added on the other side of the electromagnet coil, forming a symmetrical structure.
The electromagnet's current links the display of time on the clockface with the measurement device in the chronoscope.
