JAMB - Physics (2015 - No. 26)
The device in which one circuit controls another, especially if the current in the second circuit is large or dangerous is known as
Electromagnetic devices
Magnetic relay device
None at all
Sextant
הֶסבֵּר
Magnetic relay device :is the device that controls a circuit (i.e one circuit )if a current in the second circuit is large or dangerous