The filament of an incandescent light bulb is made of tungsten which has a thermal coefficient of resistivity of α = 4.4 x 10-3 K-1. The filament is initially at room temperature, To = 293 K. When it is connected across a V = 110 volt power supply the filament quickly heats up to T = 3300 K at which time the current flowing through the filament is I = 1.2 amps. A) Write an equation for the initial current, I0, that flows through the filament when it is initially turned on. (e.g., when it is still at room temperature). B) Find the numerical value of the current in amps when the filament is at room temperature.

Q: A copper wire has a resistance of 0.480 Ω at 20.0°C, and an iron wire has a resistance of 0.519 Ω at…

A: We have given Resistance of copper wire (Rc)=0.480 ohmTemperature (T)=20°CResistance of Iron  wire…

Q: An automobile battery has an emf of 12.4 V and an internal resistance of 0.09 Ω. The headlights have…

A: The resistive circuits are governed by Ohm's law, which is as follows, E=IR        (1) here E is the…

Q: At room temperature (27.0 °C) the resistance of a heating element is 100 Ω. What is the temperature…

A: Given,

Q: our body is a moderately good conductor of electricity. Taken as a whole, your body's resistance…

A: resistance of body when it is dry = 1500 ohm resistance of body when it is wet = 500 ohm Voltage (V)…

Q: Cell membranes contain channels that allow ions to cross the phospholipid bilayer. Suppose that a…

A: Current Time interval

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A:

Q: A potential difference of 11 V is found to produce a current of 0.38 A in a 3.5 m length of wire…

A:

Q: If the 0.190 mm diameter tungsten filament in a light bulb is to have a resistance of 0.122 N at…

A:

Q: Current Attempt in Progress The figure shows a resistor of resistance R = 6.32 connected to an ideal…

A: Given, Resistance R =6.32Ω Emf of the battery E =14.0V Length of the wire  l =22.0cm =0.22m Radius…

Q: A wire with a resistance of 6.0 is drawn out through a die so that its new length is three times its…

A:

Q: I have some 11-gauge copper wire (diameter = 2.304 mm) that I want to run from my house to my shed.…

A: First you calculate the resistance as given thatvoltage , V=120 Vcurrent , I=0.5 Athusby ohms…

Q: Suppose that the resistance between the walls of a biological cell is 5.1 × 109 Ω. (a) What is the…

A: Required : (a) What is the current when the potential difference between the walls is 76 mV?  (b) If…

Q: Consider a portion of a cell membrane that has a thickness of 7.50 nm and 1.2 um x 1.2 um in area. A…

A:

Q: Suppose that the resistance between the walls of a biological cell is 5.9 × 109 Ω. (a) What is the…

A: Given that:- Resistance between the walls of a biological cell=5.9×10^9 ohm

Q: A wire is 100.0 m long and 0.800 mm in diameter. The first x meters of the wire is made of copper…

A: Given: The length of the wire is 100 m. The diameter of the wire is 0.800 mm. The potential…

Q: In the figure, E₁ = 6.00 V, E₂ = 12.0 V, R₁ = 100 N, R₂ = 200 N, and R3 = 300 N. What are the size…

A:

Q: Three resistors R₁ = 89.0 2, R₂ = 19.92, R3 = 70.0 2, and two batteries &₁ = 40.0 V, and &₂ = 356 V…

A: Given data: R1=89.0 ΩR2=19.9 ΩR3=70.0 Ωξ1=40.0 Vξ2=356 V We need to find the current flowing through…

Q: The rear window of a van is coated with a layer of ice at 0°C. The density of ice is 917 kg/m³, and…

A:

Q: person notices a mild shock if the current along a path through the thumb and index finger exceeds…

A: V = IR

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A:

Q: Consider a portion of a cell membrane that has a thickness of 7.50 nm and 1.8 pm x 1.8 pm in area. A…

A:

Q: The heating element of an electric toaster is typically made of nichrome wire (an alloy of nickel…

A: The resistance is given by  R = ρLA where, L is the length and A is the area, ρ is the resistivity.

Q: In her bathroom, Mindy has an overhead heater that consists of a coiled wire made of nichrome that…

A:

Q: If the 0.100 mm diameter tungsten filament in a light bulb is to have a resistance of 0.162 2 at…

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Q: Suppose that the resistance between the walls of a biological cell is 3.6 x 10° Q. (a) What is the…

A:

Q: A long wire with a radius of 0.350 cm carries a current. The potential difference across a 3.00 m…

A:

Q: A copper wire has a resistance of 0.505 Ω at 20.0°C, and an iron wire has a resistance of 0.537 Ω at…

A:

Q: A copper wire has a resistance of 0.400 Ω at 20.0°C, and an iron wire has a resistance of 0.426 Ω at…

A: To determine: The temperature at which the resistance of the copper and iron will be equal   Given:…

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A:

Q: A potential difference of 11 V is found to produce a current of 0.42 A in a 2.8 m length of wire…

A:

Q: A resistor made of Nichrome wire is used in an application where its resistance cannot change more…

A: We have a nichrome wire which has a resistance say Ro at 20oC and it cannot change more than 1.35%…

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Q: The figure gives the electric potential V(x) along a copper wire carrying uniform current, from a…

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A:

Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.