A thermocouple is a simple device used to measure temperature. It consists of two different types of metal wires joined at one end. When the joined end is heated or cooled, it produces a small voltage that can be measured. This voltage changes with temperature, allowing us to determine how hot or cold something is. Thermocouples are widely used in various applications, from household appliances to industrial processes. These devices are popular because they are durable, inexpensive, and can measure a wide range of temperatures. They are often found in equipment like ovens, furnaces, and thermometers. By converting temperature differences into electrical signals, thermocouples help ensure safety and efficiency in many settings.