The heater wire of thermocouple instruments is madevery thin in order to have
Answers
Answer:
least skin effect in the heater wire.
Explanation:
Thermocouple instrument consists of a heater wire, thermocouple (made of two different metals) and a galvanometer to measure the current passing through the thermocouple.
The thermocouple works on the principle that an EMF voltage is induced between two ends of the thermocouple due to the temperature difference between the two ends. This is called Seebeck effect. The temperature difference occurs due to the junction of the two metals is at a hot temperature and the other end is cooler.
The heater element is heated due to the current passing through it. When high frequency AC current passes through the heater element, there is more resistance (reactance) due to the higher frequency in the inner part of the heater wire. The current passes more through the outer part of the wire dueto less reactance there. This is called skin effect, and happens in AC current measurement or voltage measurement.
When the current passes improperly due to skin effect the measured values are not correct. So to reduce the skin effect, the heater wire is made thin.
Explanation:
This is called skin effect, and happens in AC current measurement or voltage measurement. When the current passes improperly due to skin effect the measured values are not correct. So to reduce the skin effect, the heater wire is made thin.