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categoryهندسة كهربائية
schoolبكالوريوس
event_available2026-07-14
السؤال
Transcribed Image Text:
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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