Physics Laboratory Experiments
8th Edition
ISBN: 9781285738567
Author: Jerry D. Wilson, Cecilia A. Hernández-Hall
Publisher: Cengage Learning
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Chapter 25, Problem 6ASA
To determine
The temperature scale used in the equations to determine the temperature dependence of resistance.
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The resistance of a cylindirical wire is measured as R = 2002 at 24°C. At what temperature will the resistance be increased by 15%, assuming that the length and the cross-sectional area does not change. (Give your
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A resistor made of Nichrome wire is used in an application where its resistance cannot change more than 1.65% from its value at 20.0°C. Over what temperature range can it be used? The temperature coefficient of resistivity for Nichrome is 0.4 x 10-3 (°C)-1,
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What is the expression that gives the temperature dependence of resistance? What is the ratio of R to R, if the change cannot be more than 1.65%?°C
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What is the expression that gives the temperature dependence of resistance? What is the ratio of R to Ro if the change cannot be more than 1.65%?°C
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A jeweler uses a draw plate to stretch a wire to five times its original length. By what factor does its resistance increase?
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What happens to the cross sectional area of the wire when the length is increased?
Digital thermometers often make use of thermistors, a type of resistor with resistance that varies with temperature more than stand.
Find the temperature coefficient of resistivity (in ("C)) for a linear thermistor with resistances of 76.2 Q at 0.00°C and 294 Q at 526
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Chapter 25 Solutions
Physics Laboratory Experiments
Ch. 25 - Prob. 1ASACh. 25 - Prob. 2ASACh. 25 - Distinguish between a positive and a negative...Ch. 25 - Are the of a metal conductor and the of a...Ch. 25 - What are the circuit conditions when a Wheatstone...Ch. 25 - Prob. 6ASACh. 25 - What is the value of for copper in terms of...Ch. 25 - Prob. 3QCh. 25 - Prob. 4QCh. 25 - Prob. 5Q
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- To what value would you have to raise the temperature of a copper wire (originally at 20 °C) to increase its resistance by 18 % ? Assume the temperature coefficient of resistivity of copper is 0.0039 (°C) 1. Express your answer using two significant figures. ? Tinal = °C Submit Request Answerarrow_forwardcalculate the resistance of each material. Simplify your answers with the correct number of significant figures.arrow_forwardDigital thermometers often make use of thermistors, a type of resistor with resistance that varies with temperature more than standard resistors. Find the temperature coefficient of resistivity (in (°C)-1) for a linear thermistor with resistances of 68.2 Q at 0.00°C and 2240 at 529°C. HINT (°C)-1 Need Help? Read It Watch Itarrow_forward
- A common flashlight bulb is rated at 0.37 A and 2.2 V (the values of the current and voltage under operating conditions). If the resistance of the bulb filament at room temperature (20°C) is 1.1 N, what is the temperature of the filament when the bulb is on? The temperature coefficient of resistivity is 5.1 x 10-3 K-1 for the filament material. Number Units Use correct number of significant digits; the tolerance is +/-1 in the 2nd significant digitarrow_forwardif possible, please write on paper and upload photo of paper. Other forms of answers do not show for me. A common flashlight bulb is rated at 0.300 A and 2.70 V (the values of the current and voltage under operating conditions). If the resistance of the bulb filament at room temperature (20°C) is 2.20 Ω, what is the temperature of the filament, in degrees Celcius (degC), when the bulb is on? The filament is made of tungsten.arrow_forwardThe resistivity of a material used to make a round 950W resistor is 53W per unit length. If the resistor has a radius of 0.16 in, what is it’s length?arrow_forward
- For each of the three simple circuit boards you will need to calculate the total resistance Reg for the entire circuit board by using the measured resistances of each of the resistors, and the equations given to you in the theory section. Then using the applied voltage of 2V, as the theoretical voltage Vth for the entire circuit board you can calculate the theoretical current, ith, for the entire circuit board. Table 1(Resistors in series) R(Q) 310 10 100 200 Req 10Ω 1000 200Ω iex(A) 0.0074 0.0064 0.068 0.0064 0.650 0.0064 1.283 Using the equations for resistors in series calculate the theoretical voltages, and currents for each of the resistors, and the entire circuit. Use the measured values of the resistance in your calculations. Then calculate the % errors. Show work. Vex(V) 2.006 ith(A) Vth(V) % Error i % Error Varrow_forwardWhat is the resistance (in units of 2) of a wire made of a material with a resistivity of 3.2 x 10-8.m, if its length is 49.1 m and its diameter is 0.50 mm? Solect ono:arrow_forwardA thermometer made of Platinum has a resistance of 50 N at 20 C, what is the measured temperature (in units of C) when its resistance is 79.3 N. Assume the temperature coefficient of resistivity to be a= 3.92× 10-3C-1arrow_forward
- A certain material is in a room at 25°C. If the absolute temperature (K) of the material is tripled, its resistance doubles. (Water freezes at 273 K.) What is the value for α, the temperature coefficient of resistivity?arrow_forwardA wire of one metal has twice the resistivity, twice the diameter and twice the length of a wire of another metal. What is the ratio of the resistances of the two wires? Give a numberical value and explain your reasoning.arrow_forwardA 5-meter-long conductor wth the diameter of 5mm is connected to a source and an external resistance. The temperature of the conductor changes from 25 degrees to 35 degrees. Determine the resistivities and resistances at each temperature. Thermal coefficient of the conductor is 40 x 10-3 and the conductivity at 20°C is 2.5465 x 104 per ohm-meter.arrow_forward
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