Pearson eText -- Physics for Scientists and Engineers with Modern Physics -- Instant Access (Pearson+)
5th Edition
ISBN: 9780137488179
Author: Douglas Giancoli
Publisher: PEARSON+
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Chapter 25.4, Problem 1FE
To determine
The number of times greater, if the resistance of the tungsten filament at its operating temperature than its resistance at room temperature.
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(a) To what temperature must you raise a copper wire, originally at 20 °C, to double its resistance,
neglecting any changes in dimensions? Use a = 3.9×10
1
-3
O
Yes
No
O
T=
(b) Does this happen in household wiring under ordinary circumstances?
In order to double its resistance, by how much would you have to increase the temperature of a piece of the following?
(a) copper (The temperature coefficient of resistance for copper is 3.9 × 10-3 (°C)-¹.)
°C
(b) Nichrome (The temperature coefficient of resistance for Nichrome is 4.0 × 10-4 (°C)-¹.)
°C
A piece of Nichrome wire has a radius of 6.5 x 10-4 m. It is used in a laboratory to make a heater that dissipates 3.00×102 W of power when connected to a voltage source of 120 V. Ignoring the effect of temperature on resistance, estimate the necessary length of wire.
Chapter 25 Solutions
Pearson eText -- Physics for Scientists and Engineers with Modern Physics -- Instant Access (Pearson+)
Ch. 25.2 - If 1 million electrons per second pass a point in...Ch. 25.2 - Prob. 1BECh. 25.3 - Return to the Chapter-Opening Question, page 651,...Ch. 25.4 - Prob. 1DECh. 25.4 - Prob. 1EECh. 25.4 - Prob. 1FECh. 25.4 - How many 60-W 120-V lightbulbs can operate on a...Ch. 25.6 - Each channel of a stereo receiver is capable of an...Ch. 25 - What quantity is measured by a battery rating...Ch. 25 - When an electric cell is connected to a circuit,...
Ch. 25 - When a flashlight is operated, what is being used...Ch. 25 - One terminal of a car battery is said to be...Ch. 25 - When you turn on a water faucet, the water usually...Ch. 25 - Can a copper wire and an aluminum wire of the same...Ch. 25 - The equation P = V2/R indicates that the power...Ch. 25 - What happens when a lightbulb burns out?Ch. 25 - If the resistance of a small immersion heater (to...Ch. 25 - Prob. 10QCh. 25 - Explain why lightbulbs almost always burn out just...Ch. 25 - Which draws more current, a 100-W lightbulb or a...Ch. 25 - Electric power is transferred over large distances...Ch. 25 - A 15-A fuse blows repeatedly. Why is it dangerous...Ch. 25 - When electric lights are operated on low-frequency...Ch. 25 - Driven by ac power, the same electrons pass back...Ch. 25 - The heating element in a toaster is made of...Ch. 25 - Is current used up in a resistor? Explain.Ch. 25 - Compare the drift velocities and electric currents...Ch. 25 - A voltage V is connected across a wire of length l...Ch. 25 - Why is it more dangerous to turn on an electric...Ch. 25 - Prob. 1PCh. 25 - Prob. 2PCh. 25 - Prob. 3PCh. 25 - Prob. 4PCh. 25 - Prob. 5PCh. 25 - Prob. 6PCh. 25 - Prob. 7PCh. 25 - Prob. 8PCh. 25 - Prob. 9PCh. 25 - Prob. 10PCh. 25 - Prob. 11PCh. 25 - Prob. 12PCh. 25 - Prob. 13PCh. 25 - Prob. 14PCh. 25 - Prob. 15PCh. 25 - (II) A rectangular solid made of carbon has sides...Ch. 25 - (III) A hollow cylindrical resistor with inner...Ch. 25 - Prob. 63GP
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- The temperature coefficient of a certain conducting material is 4.52 × 10-4 (°C)-¹. (a) At what temperature would the resistance be 2 times the resistance at 20.0°C? (Use 20.0°C as the reference point in P = Po = Poa(TTO).) (b) Does this temperature hold for all copper conductors, regardless of shape or size? (a) Number i (b) Yes Units °℃arrow_forwardplease helparrow_forwardThe temperature coefficient of a certain conducting material is 4.78 × 10-3 (°C)-1. (a) At what temperature would the resistance be 3 times the resistance at 20.0°C? (Use 20.0°C as the reference point in ρ-ρ0=ρ0α(T-T0).) (b) Does this temperature hold for all copper conductors, regardless of shape or size?arrow_forward
- (25%) Problem 6: A copper wire has a resistance of 0.495 2 at 20.0°C, and an iron wire has a resistance of 0.535 2 at the same temperature. D A At what temperature, in degrees Celsius, are their resistances equal? The temperature coefficient of resistivity of copper is 3.9 x 10-3 (°C)-!, while that for iron is 5.0 x 10-3 (°C)-!. T = sin() cos() tan() 9 HOME cotan() asin() acos() E 4 5 6. atan() acotan() sinh() 1 3 cosh() tanh() cotanh() END O Degrees O Radians Vol BACKSPACE D CLEARarrow_forward1. (a) A certain conductor has a resistance of 10 ohms. It is placed between the poles of a cell whose potential is 5 volts. What current will pass through the conductor if the voltage remains constant at the value given? (b) How many coulombs of electricity will pass through the conductor if this current is maintained for 20 minutes? c) what will be the energy expended during this time interval?arrow_forwardA current of 3.70 A is carried by a 250 m long copper wire of radius 1.25 mm. Assume an electronic density of 8.47 x 10m, resistivity p = 1.67 x 10*2 · m, and resistivity temperature coefficient of a= 4.05 x 10-3 °C-1 at 20 °C. (a) Calculate the drift speed of the electrons in the copper wire. (b) Calculate the resistance of the at 35 °C. (c) Calculate the difference of potential between the two ends of the copper wire.arrow_forward
- (a) Digital medical thermometers determine temperature by measuring the resistance of a semiconductor device called a thermistor (which has α = – 0.0600 / ºC ) when it is at the same temperature as the patient. What is a patient’s temperature if the thermistor’s resistance at that temperature is 82.0% of its value at 37.0ºC (normal body temperature)?(b) The negative value for α may not be maintained for very low temperatures. Discuss why and whether this is the case here. (Hint: Resistance can’t become negative.)arrow_forwardSuppose that you wish to fabricate a uniform wire out of 2.0 gram of copper. The resistance of wire is to be 0.8 ohms and if all of the copper are to be used, what will be the diameter of wire? Specific resistance is 1.72 x 10^-8 ohm-meter and mass density is 8.92 x 10^3 kg/m3.arrow_forward9:27 (23) شهد قېل 6 دقائق What is the resistance (in units of a) of a wire made of a material with a resistivity of 3.2 x 100. m, if its length is 18.5 m and its diameter is 0.50 mm?arrow_forward
- Given that copper's temperature coefficient of resistivity is about 3.9 x 10-3 °C-!, to what temperature must you raise a copper wire originally at 18.9 °C in order to double its resistance? Neglect any changes in dimensions. temperature: °C Does this happen in household wiring under ordinary circumstances? yes O noarrow_forwardThe questionarrow_forward(b) 1. A platinum resistance sensor has a resistance of 100 2 at 0 °C and a temperature coefficient of resistance (oc) of 4 x 10 "C. If the resistance of the sensor is 125 O, find the corresponding temperature of the sensor. ii. A variable dielectric capacitive displacement sensor consists of two square metal plates of side 5 cm, separated by a gap of 1 mm. A sheet of dielectric material 1 mm thick and of the same area as the plates can be slide between them as shown in Figure Q.4b. Given that the dielectric constant of air is 1 and that of the dielectric material is 4, calculate the capacitance of the sensor when the input displacement x-0.0 cm, 2.5 cm and 5,0 cm. Figure Q4barrow_forward
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