Physics

posted by .

A certain lightbulb has a tungsten filament with a resistance of 28 Ω when cold and 144 Ω when hot.
If the equation R = R0 [1 + α ∆T ]
can be used over the large temperature range involved here, find the temperature of the fila- ment when it is hot. Assume that α , the tem- perature coefficient of resistivity of tungsten, is0.0045(◦C)−1 andthatthetemperatureof the cold filament is 17◦C.
Answer in units of ◦C.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. College Physics

    Common light bulbs have a mental filament made of tungsten and when a current passes through it, it radiates visible light, as well as heat. If initially the filament's resistance is 2.45 Ω (6%) at 20 degrees Celsius and the temperature …
  2. physics

    the figure is 4.00 W. E 3.0 Ω 15.0 Ω 5.0 Ω 4.3 Ω 3.0 Ω Find the equivalent resistance of the circuit. Answer in units of Ω
  3. physics

    Consider the following circuit. 7.3 Ω 3.0 Ω 3.0 Ω 4.5 Ω 1.0 Ω 3.0 Ω 4.5 Ω 19.0 Ω 19.0 Ω 30 V Find the equivalent resistance. Answer in units of Ω
  4. Physics

    Four resistors 2.1Ω, 3.2 Ω, 4.3 Ω, and 5.4 Ω are connected in a series to a 9 V battery. The effective resistance in the circuit is:
  5. physics

    Two resistors connected in series have an equivalent resistance of 783.4 Ω. When they are connected in parallel, their equivalent resistance is 171.3 Ω. Find the resistance of each resistor. Ω (small resistance) Ω …
  6. physics

    What is the minimal resistance of a 100 W light bulb designed to be used in a 120 V circuit?
  7. Physics

    What is the equivalent resistance of a parallel circuit with a 5.0 kΩ resistor, a 2.5 kΩ resistor, and 10.0 kΩ resistor?
  8. Calculus 1

    If two resistors with resistances R1 and R2 are connected in parallel, as in the figure below, then the total resistance R, measured in ohms (Ω), is given by 1/R= 1/R1+ 1/R2. If R1 and R2 are increasing at rates of 0.3 Ω/s …
  9. Calculus 1

    If two resistors with resistances R1 and R2 are connected in parallel, as in the figure below, then the total resistance R, measured in ohms (Ω), is given by 1/R= 1/R1+ 1/R2. If R1 and R2 are increasing at rates of 0.3 Ω/s …
  10. physics

    Temperatures are often measured with electrical resistance thermometers. Suppose that the resistance of such a resistance thermometer is 177Ω when its temperature is 28.7 °C. The wire is then immersed in a liquid, and the resistance …

More Similar Questions