Which device is used to monitor throttle position on the computer?

The correct choice, which indicates that a potentiometer is used to monitor throttle position on the computer, is based on how throttle position sensors function within an engine management system.

A potentiometer operates based on variable resistance. As the throttle plate opens and closes, the potentiometer's wiper moves along a resistive track. This change in resistance correlates directly to the position of the throttle. The engine control unit (ECU) interprets the resistance value from the potentiometer to determine the exact position of the throttle, which is crucial for optimizing engine performance and efficiency.

Potentiometers are commonly used in many automotive applications for their reliability and precision in measuring varying positions, particularly where linear or rotational movement occurs. In the case of throttle position, accurate readings are vital for effective fuel management and emission control.

While transducers and sensors can also monitor different parameters, the specific operation and design of a potentiometer make it the ideal choice for directly detecting throttle position in this scenario. Amplifiers, on the other hand, are used in various circuits to increase signal strength but do not directly measure physical positions like a potentiometer does.