A simple thermocouple circuit is formed using two wires of different alloy: one
ID: 2073605 • Letter: A
Question
A simple thermocouple circuit is formed using two wires of different alloy: one end of the wires is twisted together to form the measuring junction, while the other ends are connected to a digital voltmeter, forming the reference junction. A voltage is set up by the difference in temperature between the two junctions. For a given pair of alloy material and reference junction temperature, the temperature of the measuring junction is inferred from the measured voltage difference. What are the dependent and independent variables during practical use? What about during a calibration?Explanation / Answer
The voltage mesured is a dependent variable in the above system as it depends on the tempeerature between the circuits. The temperature is a independent variable as it depends on the reference junction.Here the electric potential varies according to change in temperatue so the electric potential is a dependent variable.
The thermocouple is calibrated by plotting voltage-temperature curve. During calibration the voltage needs to be stabilized.Here the temperature of water used for calibration is increased and the stable nature of voltage is noted.Hence in this case the voltage is stable and independent.
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