Which transducer varies pressure and voltage?

• A. I/P
• B. Diode
• C. Binary
• D. Ultrasonic

Answer: (A)

Think about how a transducer turns an electrical signal into a physical pressure. An I/P transducer is designed to take an electrical current (often from a control loop) and convert it into a proportional pneumatic pressure. As the input current changes, the output pressure changes accordingly, so it directly varies pressure in response to the electrical signal. The other options don’t do this: a diode is just an electrical component with no pressure output, binary is digital logic, and an ultrasonic transducer generates or detects high-frequency sound waves rather than providing a controllable pneumatic pressure in a typical control loop. Therefore, the current-to-pressure transducer is the one that varies pressure in response to the electrical signal.