What is a sensor?

What is a sensor?

• A. A device that sends information to a control module
• B. A device that stores fuel
• C. A device that powers the stereo
• D. A type of fuse

Answer: (A)

A sensor is a device that detects a physical condition and sends information to a control module. In vehicles, sensors monitor things like temperature, pressure, position, and speed, converting that measurement into an electrical signal that the engine or other control modules read. The control module then uses that data to adjust systems such as fuel delivery, ignition timing, transmission behavior, or airbags. This is why the description of a sensor as a device that sends information to a control module is the best choice. The other options describe storing fuel, powering the stereo, or a fuse—functions that are not about sensing inputs.

A sensor is a device that detects a physical condition and sends information to a control module. In vehicles, sensors monitor things like temperature, pressure, position, and speed, converting that measurement into an electrical signal that the engine or other control modules read. The control module then uses that data to adjust systems such as fuel delivery, ignition timing, transmission behavior, or airbags. This is why the description of a sensor as a device that sends information to a control module is the best choice. The other options describe storing fuel, powering the stereo, or a fuse—functions that are not about sensing inputs.