A transducer ________ one form of ________ into another.

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

Answer: (A)

The main idea here is how a transducer handles energy. A transducer is designed to change energy from one form to another. In ultrasound, that means taking electrical energy and turning it into mechanical energy to produce sound waves, and then using mechanical energy from incoming waves to generate electrical energy again. That conversion between energy forms is the defining function.

So, the best fit is "converts energy" because it accurately describes changing energy from one form to another. Using "transforms energy" is close in meaning but not the standard wording for this context. "Power" is a rate, not a form of energy, so it doesn’t describe what a transducer does. "Shifts energy" is vague and not the precise terminology used in this field.