open or close a circuit at a designated temperature
A thermocouple is a temperature sensor that consists of two wires made from different conductors. The junction of these two wires produces a voltage based on the temperature difference between them and can be used like a switch to open or close the circuit at a designated temperature.
B link the temperature of one component in the circuit to that of another component in the circuit
C increase or decrease the temperature of a component in the circuit
D keep the circuit at a designated safe temperature