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 industrial processes to household appliances. These devices are popular because they are durable, inexpensive, and can measure a wide range of temperatures. You can find thermocouples in ovens, furnaces, and even in scientific research settings. Their versatility makes them essential tools in many fields.