Thermocouples convert___________________?
Correct answer: A. heat energy into electrical energy
- A. heat energy into electrical energy
- B. heat energy into light energy
- C. heat energy into mechanical energy
- D. mechanical energy into heat energy
Explanation
A thermocouple uses the Seebeck effect: a temperature difference between two junctions produces an EMF and hence electrical energy. Option b, light energy, confuses a thermocouple with a device such as an LED or photovoltaic cell.
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About Thermal Equilibrium and Heat
Thermal equilibrium means that bodies in contact have the same temperature and no net heat flows between them. The topic distinguishes heat from temperature, uses the zeroth law of thermodynamics, and covers heat transfer, specific heat capacity, thermal expansion and the conditions for reaching equilibrium.
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