Which device is used to measure load weight during lifting?

• A. Load cell
• B. Temperature sensor
• C. Altimeter
• D. Pressure gauge

Answer: (A)

Measuring the weight of a load during lifting is done with a load cell, a sensor that directly converts the force of the load into an electrical signal. When the crane lifts, the load places stress on the cell; strain gauges inside the cell deform slightly, changing electrical resistance in a Wheatstone bridge. This change is converted into a readable weight value (kg or lb) and is often fed into the crane’s controls or a readout so the operator can see the actual load and avoid overload. The other devices aren’t used for this purpose: a temperature sensor measures heat, an altimeter measures height, and a pressure gauge measures fluid or air pressure. So the device that measures load weight during lifting is the load cell.