Thermocouple
A thermocouple is a temperature sensor made by joining two different metals at one end.
When the joined end is heated, it produces a small voltage. This voltage changes with temperature — and we can measure it to know how hot something is.
How It Works:
Two metals → joined at one end (called the hot junction)
Other ends → connected to a voltmeter (called the cold junction)
Temperature difference = small electric current generated(This is called the Seebeck effect)
Uses of Thermocouples:
Measuring temperature in engines, furnaces, labs
Industrial and scientific experiments
In thermometers for extreme temperatures
Why It’s Useful:
Simple, cheap, and durable
Works in very hot or cold conditions
Gives instant temperature readings
