This lesson introduces the fundamental concepts of measurement systems and their role in instrumentation and control engineering. It explores how physical quantities—such as voltage, current, pressure, temperature, and flow—are measured, converted into electrical signals, and processed for monitoring and automation. Students learn about the essential components of a measurement system (sensor, transducer, signal conditioner, and display), accuracy and error analysis, and the principles of control systems. The topic emphasizes the importance of precision, calibration, and feedback in ensuring safe, efficient, and reliable operation of electrical and industrial systems.