Question

rtds measure temperature using changes in...

select one:
a. electrical resistance
b. color
c. pressure
d. sound

Explanation:

Define RTD and its operating principle

RTD stands for Resistance Temperature Detector. It is a sensor whose electrical resistance changes predictably with temperature.

Evaluate the given options

• a. Electrical resistance: This directly matches the operating principle of an RTD.
• b. Color: Thermochromic materials change color with temperature, not RTDs.
• c. Pressure: Piezoelectric or capacitive sensors measure pressure, not RTDs.
• d. Sound: Acoustic sensors use sound waves, not RTDs.

Answer:

• a. Electrical resistance (Correct answer)
• b. Color
• c. Pressure
• d. Sound