How does a paddle wheel measure flow?

Answer: B — It spins wheels as water moves past, translating this into a measurement

A paddle wheel measures flow by utilizing a mechanism that consists of a wheel with blades or paddles attached to it. When fluid flows through the pipe, it moves past the paddle wheel, causing it to spin. The rotational speed of the wheel is directly proportional to the velocity of the fluid flowing through the pipe. This movement is then translated into a flow measurement, which can be displayed on a gauge or transmitted to a monitoring system. The design of the paddle wheel allows it to provide an accurate representation of the flow rate, as the resistance created by the paddles enables the system to respond quickly to changes in flow. Factors such as the diameter of the wheel and the dimensions of the pipe are calibrated to ensure precise readings. By focusing on how the mechanical action of spinning translates flow rate into usable data, it becomes clear why this method is widely employed in various applications requiring flow monitoring, particularly in water supply and industrial processes.