Question 6 (a) Explain the working principles of: (i) thermistor. (ii) resistance temperature detector (RTD).

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Question 6
(a) Explain the working principles of:
(i)
thermistor.
(ii)
resistance temperature detector (RTD).
(b)
Given a Wheatstone bridge as shown in Figure 2, derive the offset voltage,
AV. Determine the value of AV if V = 1 volt, R₁ = 120 2, R₂ = 1202, R3 =
240 2, and R4 = 100 2.
A RTD was applied to a hot body surface to obtain the temperature reading.
Knowing that the fractional change in resistance per degree of temperature
(a) is 0.001875 2/°C and R(75°C) = 110.2 2. Determine the RTD
resistance if the actual surface temperature is 81°C.
R₁
R₂
(c) -
ww
ww
ww
R3
Figure 2: Wheatstone bridge
R₁
Transcribed Image Text:Question 6 (a) Explain the working principles of: (i) thermistor. (ii) resistance temperature detector (RTD). (b) Given a Wheatstone bridge as shown in Figure 2, derive the offset voltage, AV. Determine the value of AV if V = 1 volt, R₁ = 120 2, R₂ = 1202, R3 = 240 2, and R4 = 100 2. A RTD was applied to a hot body surface to obtain the temperature reading. Knowing that the fractional change in resistance per degree of temperature (a) is 0.001875 2/°C and R(75°C) = 110.2 2. Determine the RTD resistance if the actual surface temperature is 81°C. R₁ R₂ (c) - ww ww ww R3 Figure 2: Wheatstone bridge R₁
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