An MRI (or magnetic resonance imaging) scan is a radiology technique that uses magnetism, radio waves, and a computer to produce images of body structures. The MRI scanner is a tube surrounded by a giant circular magnet. The patient is placed on a moveable bed that is inserted into the magnet.
electrical switch. Thesaurus. Definitions of electrical switch. 1. n control consisting of a mechanical or electrical or electronic device for making or breaking or changing the connections in a circuit. switch for reversing the direction of an electric current. a switch that interrupts an electric circuit in the event of an overload.
In switch language, open means to disconnect, or break the circuit. Some people call this turned off. Closed, is to connect, or make the circuit. Some people call this turne â¦ d on. In the case of a normally open switch, the switch is open (off) unless something takes action on the switch. Pushes a button for example, or holds a magnet near the switch, or other active force. A normally closed switch is closed (on) unless some force causes the switch to be opened.