1. Thermistors a) sense large changes in temperature b) cannot sense any change in temperature c)...
1. Thermistors
a) sense large changes in temperature
b) cannot sense any change in temperature
c) sense small changes in temperature
d) have a positive temperature coefficient of resistance
2. Thermistors follows which law for small variations
a) Charle's law
b) Ohm's Law
c) NTC's law
Homework Answers
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1. Thermistors
a) sense large changes in temperature
b) cannot sense any change in temperature
c)...
Thermistor Questions: 1. In a positive temperature coefficient thermistor, a temperature increase causes what change in...
Thermistor Questions: 1. In a positive temperature coefficient thermistor, a temperature increase causes what change in the resistance? a) Increase b) Decrease c) Remain the same d) Insufficient information given 2. Which of the following would not be a possible application for a thermistor? a) Electronic thermometer b) Fire detection and warning system c) Fuse d) Temperature compensation for PTC components
The temperature coefficient of resistance α in equation R(T)=R0[1+α(T−T0)] equals the temperature coefficient of resistivity α...
The temperature coefficient of resistance α in equation R(T)=R0[1+α(T−T0)] equals the temperature coefficient of resistivity α in equation ρ(T)=ρ0[1+α(T−T0)] only if the coefficient of thermal expansion is small. A cylindrical column of mercury is in a vertical glass tube. At 20 ∘C, the length of the mercury column is 12.0 cm. The diameter of the mercury column is 1.6 mm and doesn't change with temperature because glass has a small coefficient of thermal expansion. The coefficient of volume expansion of...
Temperature Phase change zone Freezing Melting 3. Water is the most commonly used natural phase change...
Temperature Phase change zone Freezing Melting 3. Water is the most commonly used natural phase change material (PCM). As shown in the figure, PCM experiences three stages when energy is provided. Which of the following is inccorrect about PCM? A. Stage (1) & (3) are sensible heating B. In stage (2), latent heat of PCM is used to change its phase instead of changing the temperature C. Once phase changes, PCM cannot adapt to temperature change in its environment D....
1) (lab manual, Ch. 22.5) State Ohm's law in words. a. (lab manual, Equation 22.8) Write...
1) (lab manual, Ch. 22.5) State Ohm's law in words. a. (lab manual, Equation 22.8) Write the corresponding equation for Ohm's law. Define all variables. What are the SI units of each variable? b. (Example 22.5) If a potential difference of 3.0 V and a current of 0.10 A is measured in the circuit, what is the measured resistance value of the resistor? Include all units. c. (lab manual, Ch. 22.5) How can resistance be determined for an ohmic device...
1. When a variable star periodically changes its luminosity, each of the following also changes periodically...
1. When a variable star periodically changes its luminosity, each of the following also changes periodically except one. Which one does not change? a) size b) temperature c) radial surface speed d) rotation rate 2. Evidence for the conclusion that the longer-living gamma ray bursters are very distant comes from the a) delay in the arrival of the visible pulse behind the gamma-ray pulse, caused by the passage of the light through optically thick intergalactic material b) extreme redshift of...
stuck on these 2 questions 1. A resistor made of Nichrome wire is used in an...
stuck on these 2 questions 1. A resistor made of Nichrome wire is used in an application where its resistance cannot change more than 2.53% from its value at 20.0°C. What is the highest temperature at which this resistor can be reliably used? The temperature coefficient of resistivity for Nichrome is 0.4 ✕ 10−3 (°C)−1. 2. An electronic device designed to operate at any temperature in the range from −9.9°C to 78.7°C contains pure carbon resistors. What is the percent...
The temperature coefficient of resistivity of a material is 0.0036 (C°)-1. By how much ΔT does...
The temperature coefficient of resistivity of a material is 0.0036 (C°)-1. By how much ΔT does the temperature of a wire made from this material have to change, in order that the resistance of the wire doubles?
The temperature coefficient of resistivity of a material is 0.0049 (C°)-1. By how much ΔT does...
The temperature coefficient of resistivity of a material is 0.0049 (C°)-1. By how much ΔT does the temperature of a wire made from this material have to change, in order that the resistance of the wire doubles?
392/ C A popular 4.-Pt resistance temperature detectors have a temperature coefficient ? 0.00 Pt RTDreference...
392/ C A popular 4.-Pt resistance temperature detectors have a temperature coefficient ? 0.00 Pt RTDreference value at 0°C is 100 ?. For T 150 C which is the increment in resistance? a) 24.412; b) 39.20; c) 100.512; d) 58.8 ? (10 pts)
HELP!! ASAP please 2. Imagine that we have two large copper blocks, A and B, which...
HELP!! ASAP please
2. Imagine that we have two large copper blocks, A and B, which are isolated from the surroundings. Block A is at a temperature of 250 K, and block B is at a temperature of 300 K. As the blocks are large, we can assume that a small amount of heat flowing into or out of them is reversible, and that such a process will not change the temperature of the block. It therefore follows that for...
Temperature Phase change zone Freezing Melting 3. Water is the most commonly used natural phase change material (PCM). As shown in the figure, PCM experiences three stages when energy is provided. Which of the following is inccorrect about PCM? A. Stage (1) & (3) are sensible heating B. In stage (2), latent heat of PCM is used to change its phase instead of changing the temperature C. Once phase changes, PCM cannot adapt to temperature change in its environment D....
1) (lab manual, Ch. 22.5) State Ohm's law in words. a. (lab manual, Equation 22.8) Write the corresponding equation for Ohm's law. Define all variables. What are the SI units of each variable? b. (Example 22.5) If a potential difference of 3.0 V and a current of 0.10 A is measured in the circuit, what is the measured resistance value of the resistor? Include all units. c. (lab manual, Ch. 22.5) How can resistance be determined for an ohmic device...
392/ C A popular 4.-Pt resistance temperature detectors have a temperature coefficient ? 0.00 Pt RTDreference value at 0°C is 100 ?. For T 150 C which is the increment in resistance? a) 24.412; b) 39.20; c) 100.512; d) 58.8 ? (10 pts)
HELP!! ASAP please
2. Imagine that we have two large copper blocks, A and B, which are isolated from the surroundings. Block A is at a temperature of 250 K, and block B is at a temperature of 300 K. As the blocks are large, we can assume that a small amount of heat flowing into or out of them is reversible, and that such a process will not change the temperature of the block. It therefore follows that for...
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