Question

HOME LTE 09:48 2 Question Q1. Unanswered (Modified from problem 3.3) An RTD can be built relatively easy. Consider a copper RTD made of magnet wire (copper insulated with a polymer). The wire is 0.1mm thick and the nominal resistance required is 1802 at 25°C. Neglect the thickness of the insulating polymer. a. How long must the wire be? Answer (in m): b. Assuming we wish to wind the copper wire into a single spiral winding in 6mm in diameter so that it can be enclosed in a stainless steel tube, what is the minimum length of the RTD? Answer (in cm): What is the range of resistance of the RTD experiences for use between 0°C and 100°C, Answer (in Ω): C. 2 attempts left.

Answer 1

Give data: rightarrow the copper RTD made of the magnet wire consider here rightarrow the wire of thickness is 0.1mn rightarrow the nominae response required is 180 Ohm at 25 degrees C. * to find the long to meet be the wire be is rightarrow the probability is shown in the below step by step implies R is e Ohm/A implies R times A/e = Ohm of the wire implies here we are the R is are below implies 180 times 0.1/0.55 times 10^-8 implies 180 times 0.000328084/0.55 times 10^-8 [here 0.55 times 106-8 is copper resistivity] [the 0.1mm in the feel is 0.000328084] implies 0.05905512/5.5 times 10^-09 implies 1.35174 times 10^-03 implies 0.001351745 almostequalto 0.001352 rightarrow finally the wire long must be is 0.001352 \r\n to find the minimum length of the RTD is....? rightarrow there are the spiral winding of diameter form rightarrow here we assume to the minimum length of the RTD is implies y_8 is