What is the difference between a transducer and a sensor?

What is the difference between a transducer and a sensor?

• A. A sensor detects a physical quantity.
• B. A transducer converts a sensor's output into another form such as current or voltage.
• C. A sensor and transducer are the same device.
• D. A transducer detects a physical quantity.

Answer: (B)

The main idea here is that a transducer and a sensor serve different roles in measurement. A sensor detects a physical quantity and produces a signal that represents that quantity. A transducer, on the other hand, changes the energy or signal from one form to another. In a measurement chain, the transducer often takes the signal from the sensing element and converts it into a form that the rest of the system can use, such as current or voltage. So the correct statement reflects that conversion role: a transducer converts a sensor’s output into another form, like current or voltage. The other options describe a sensor’s function or claim they’re the same device, which isn’t accurate; a transducer is about conversion, not simply detecting.

The main idea here is that a transducer and a sensor serve different roles in measurement. A sensor detects a physical quantity and produces a signal that represents that quantity. A transducer, on the other hand, changes the energy or signal from one form to another. In a measurement chain, the transducer often takes the signal from the sensing element and converts it into a form that the rest of the system can use, such as current or voltage.

So the correct statement reflects that conversion role: a transducer converts a sensor’s output into another form, like current or voltage. The other options describe a sensor’s function or claim they’re the same device, which isn’t accurate; a transducer is about conversion, not simply detecting.