Which option best completes the statement: A transducer ________ one form of ________ into another.

• A. shifts, energy
• B. converts, energy
• C. transforms, energy
• D. converts, power

Answer: (B)

A transducer is defined by its ability to change energy from one form to another. In ultrasound, it converts electrical energy from the system into acoustic energy to produce sound waves, and when receiving, converts the returning acoustic energy back into electrical signals. This makes the precise wording to say it converts energy. The other ideas don’t fit as well: shifting energy doesn’t capture a change in energy form, and while “transforms” is close, the standard description emphasizes conversion. Power isn’t the right term here because the concept centers on energy form, not the rate of transfer.