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categoryهندسة كهربائية schoolبكالوريوس event_available2026-07-14

السؤال

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Thermistors are temperature-measuring devices based on the principle that the thermistor material exhibits a change in electrical resistance with a change in temperature. By measuring the resistance of the thermistor material, one can then determine the temperature. For a 10K3A Betatherm thermistor, Thermally -conductive epoxy coating Tin plated copper alloy lead wires Figure 1 A typical thermistor. the relationship between the resistance R of the thermistor and the temperature is given by =1.129241x10 +2.341077x10 In(R) +8.775468×10* {In(R)}' T where T is in Kelvin and R is in ohms. A thermistor error of no more than ±0.01°C is acceptable. To find the range of the resistance that is within this acceptable limit at 19 °C, we need to solve 1 19.01+273.15 and 1 18.99+273.15 1.129241x10 +2.341077x10 In(R)+8.775468×10 (In(R)}' 1.129241x10 +2.341077x10 In(R) +8.775468×10* {In(R)}" Find roots of equations using Bisection, Newton-Raphson and Secant Method to find the resistance R at 18.99°C in Excel. Please modify the above equation by replacing R with (R+5) everyone and solve the new equations.

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