thermojunction
Học thuậtThân thiện
Definition
Noun: A thermojunction is a point of contact between two different types of metal. This junction produces a small, measurable voltage when there is a difference in temperature between the junction and the other ends of the metals.
Usage
A thermojunction is the fundamental component within a thermocouple, a device used to measure temperature. The voltage generated at the thermojunction is directly related to the temperature difference.
Examples
- The scientist carefully calibrated the thermojunction to ensure accurate temperature readings.
- A voltage appears across the thermojunction when it is heated.
- The accuracy of the sensor depends on the materials used to create the thermojunction.
Advanced Usage
- Multiple Junctions: In a practical thermocouple circuit, there are at least two thermojunctions: a (hot junction) and a (cold junction). The voltage measured is proportional to the temperature between these two junctions.
Variants and Related Words
- Thermocouple (n): A temperature sensor consisting of two dissimilar metal wires joined at a thermojunction.
- Seebeck effect (n): The physical principle that describes how a temperature difference across a thermojunction creates a voltage.
- Junction (n): A point where two or more things are joined. In electronics, this often refers to a contact between different materials (e.g., p-n junction, thermojunction).
Synonyms
- Thermoelectric junction
- Thermocouple junction
Noun
- a junction between two dissimilar metals across which a voltage appears