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A resistance coil market is found to have a true resistance of 3.115 Omega at 300 K. Calculate the temperature at which marking is corrent .Temperature coefficient of resistance of the material of is 4.2xx 10^(-3).^(@)C^(-1) |
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Answer» `R_(27) = R_(0)(1+ ALPHA xx 27)` `R_(27) = R_(0)(1+ alpha xx 27)`……(i) `:. 3.115 = R_(0) (1+ 4.3 xx 10^(-3) xx27)` ....(i) and `3 = R_(0)(1+ 4.2 xx 10^(-3) xx t)`…..(ii) `:. (3)/(3.115) = (1 + 4.2 xx 10^(-3) xx t)/(1+ 4.2 xx 10^(-3) xx 27)` On SOLVING we GET `t = 17.21^(@)C` `= 17.21 xx 275 = 290.2K` |
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