Thermocouple
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A thermocouple, also known as a "thermoelectrical thermometer", is an electrical device consisting of two dissimilar electrical conductors forming an electrical junction. A thermocouple produces a temperature-dependent voltage as a result of the Seebeck effect, and this voltage can be interpreted to measure temperature. Thermocouples are widely used as temperature sensors.
Thermocouple connected to a multimeter displaying room temperature in °C
Reference junction block inside a Fluke CNX t3000 temperature meter. Two white wires connect to a thermistor (embedded in white thermal compound) to measure the reference junctions' temperature.
Typical low cost type K thermocouple (with standard type K connector). While the wires can survive and function at high temperatures, the plastic insulation will start to break down at 300 °C.
A thermocouple (the right most tube) inside the burner assembly of a water heater
Electrical connector
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Components of an electrical circuit are electrically connected if an electric current can run between them through an electrical conductor. An electrical connector is an electromechanical device used to create an electrical connection between parts of an electrical circuit, or between different electrical circuits, thereby joining them into a larger circuit.
This rear panel of an integrated amplifier features a variety of electrical connectors
Connectors on the back of a 2018 computer
NMEA 2000 cabling using M12 connectors
A 4-pin Mini-DIN S-Video cable, with notches and a rectangular alignment pin