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 2, 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

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 2, 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

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter27: Current And Resistance

Section: Chapter Questions

Problem 27.81AP: The potential difference across the filament of a light-bulb is maintained at a constant value while...

See similar textbooks

Similar questions

Resistors are commonly rated at 18W,14W,12W ,1 W and 2 W for use in electrical circuits. If a current of1 = 2.00 A is accidentally passed through a R=1.00 resistor rated at 1 W, what would be the most probable outcome? Is there anything that can be done to prevent such an accident?
If the current carried by a conductor is doubled, what happens to (a) the charge carrier density, (b) the current density, (c) the electron drift velocity, and (d) the average time interval between collisions?
A 0.900-V potential difference is maintained across a 1.50-m length of tungsten wire that has a cross-sectional area of 0.600 mm2. What is the current in the wire?
The temperature coefficient of resistivity for the metal gold is 0.0034 (C°)-1, and for tungsten it is 0.0045 (C°)-1. The resistance of a gold wire increases by 5.3 percent due to an increase in temperature. For the same increase in temperature, what is the percentage increase in the resistance in a tungsten wire?
At room temperature, what is the strength of the electric field in a 12 gauge copper wire (diameter 2.05 mm) that is needed to cause a 3.90 A current to flow? Use the resistivity at room temperature for copper ρ = 1.72×10−8 Ω⋅m. Express your answer with the appropriate units. What field would be needed if the wire were made of silver instead? Use the resistivity at room temperature for silver ρ = 1.47×10−8 Ω⋅m. Express your answer with the appropriate units.
A 16.0-mm length of wire consists of 7.0 mm of copper followed by 9.0 mm of aluminum, both of diameter 1.4 mm. A voltage difference of 95 mV is placed across the composite wire. The resistivity of copper is 1.68×10−8Ω⋅m and the resistivity of aluminum is 2.65×10−8Ω⋅m What is the total resistance (sum) of the two wires? Express your answer to two significant figures and include the appropriate units. R total= What is the current through the wire? Express your answer to two significant figures and include the appropriate units. I= What is the voltage across the copper part? Express your answer to two significant figures and include the appropriate units. VCu= What is the voltage across the aluminum part? Express your answer to two significant figures and include the appropriate units.V What is the voltage across the aluminum part? Express your answer to two significant figures and include the appropriate units. What is the voltage across the aluminum part? Express your…
A 60 W lightbulb has a resistance of 240 Ω. At the operating temperature of the tungsten filament, its resistivity is approximately 5.0 x 10-7 Ω • m. If the wire used to make the filament is 0.040 mm in diameter (a typical value). As described above the length of a 60 W, 240 Ω lightbulb filament was calculated to be 60 cm.a. If the potential difference across the filament is 120 V, what is the strength of the electric field inside the filament?b. Suppose the length of the bulb’s filament were doubled without changing its diameter or the potential difference across it. What would the electric field strength be in this case?c. Remembering that the current in the filament is proportional to the electric field, what is the current in the filament following the doubling of its length?d. What is the resistance of the filament following the doubling of its length?
A cylindrical resistor of radius 5.0 mm and length 2.0 cm is made of material that has a resistivity of 3.5 * 10-5 ohm m.What are (a) the magnitude of the current density and (b) the potential difference when the energy dissipation rate in the resistor is 1.0W?
Consider a portable electric blanket that runs on a 4.5 V battery. If you use copper wire with a 0.5 mm diameter as the heating element, how long should the wire be (in unit of meters) if you want to generate 15 W of heating power? (Take the resistivity of the copper wire as p= 1.7 x 10^(-8) Ω.m)
A copper (resistivity = 1.72 EXP-8 Ω.m) conductor with a square cross section, 1.0 mm on a side is 100 m long and is initially 20oC. 1. If the temperature coefficient (a) of copper is 0.00393 per degree Celsius, what is the change in resistance of the copper conductor if the temperature is increased to 100 degrees Celsius? 2. What is the resistance of this conductor?
What is the resistance of a 3.4-mm length of copper wire 1.3 mm in diameter? The resistivity of copper is 1.68×10^−8 Ω⋅m1 Express your answer to two significant figures and include the appropriate units.
What is the resistivity of a wire if it is subjected to a 2.50✕102 V/m electric field, and has a current density of 4.03✕10-13 A/m2?