What does an encoder measure?

• A. Speed
• B. Temperature
• C. Current
• D. Position or rotation

Answer: (D)

An encoder is a feedback device that translates mechanical movement into electrical signals, providing information about where a shaft is and how far it has rotated. As the shaft turns, the encoder produces pulses that can be counted to determine the angle or position, and the rate of those pulses can indicate speed. This makes encoders essential for precise positioning and motion control in motors and automated systems. Temperature and current are measured by other sensors, not by encoders. Some encoders give an absolute position for every angle, while others give relative position by counting increments. In short, encoders measure position or rotation, with speed being derivable from the pulse rate.