Question

sensor The outdoor lights are triggered by a motion sensor that detects changes in infrared energy given off by moving human bodies. ˈsɛnsər

Accepted Answer

A device that detects a physical quantity (such as a movement or a beam of light) and responds by transmitting a signal. Sensors are used today almost everywhere. Radar guns bounce microwaves off moving cars. A burglar alarm may use a photosensor to detect when a beam of light has been broken, or may use ultrasonic sound waves that bounce off moving objects. Still other sensors may detect pressure (barometers) or chemicals (Breathalyzers and smoke detectors). Stud finders, used by carpenters to locate wooden studs under a wall, may employ magnets or radar. Wired gloves, which relay information about the position of the fingers, are used in virtual-reality environments. A cheap car alarm may be nothing but a shock sensor, in which a strong vibration will cause two metal surfaces to come together.

word	sensor
definition	A device that detects a physical quantity (such as a movement or a beam of light) and responds by transmitting a signal.
eg_sentence	The outdoor lights are triggered by a motion sensor that detects changes in infrared energy given off by moving human bodies.
explanation	Sensors are used today almost everywhere. Radar guns bounce microwaves off moving cars. A burglar alarm may use a photosensor to detect when a beam of light has been broken, or may use ultrasonic sound waves that bounce off moving objects. Still other sensors may detect pressure (barometers) or chemicals (Breathalyzers and smoke detectors). Stud finders, used by carpenters to locate wooden studs under a wall, may employ magnets or radar. Wired gloves, which relay information about the position of the fingers, are used in virtual-reality environments. A cheap car alarm may be nothing but a shock sensor, in which a strong vibration will cause two metal surfaces to come together.
IPA	ˈsɛnsər

Moving Sensor Detects Beam Bounce Alarm Device Physical