Filament of anincandescent lightbulb is a thin tungsten wire

Reference no: EM13645851

The filament of anincandescent lightbulb is a thin tungsten wire. Suppose a lightbulbhas a resistance of 42 Ω at room temperature. During normal operation, the filament reaches atemperature of about 2990 K.

a) What is its resistance at that temperature? The temperature coefficient of resistivity for tungsten isα = 4.5 x 10^-3K−1.

Reference no: EM13645851

Questions Cloud

Minimum magnitudes of magentic force acting on this electron : An electron is accelerated through 2450 V from rest and then enters a region wherethere is a uniform 1.80 T magneticfield. What are the maximum and minimum magnitudes of the magentic force acting on this electron?

What total current is supplied to the circuit : A lamp (R = 154 Ω), anelectric heater (R = 24Ω), and a fan (R = 48Ω) are connected in parallel across a 117 V line. What total current is supplied to the circuit?

What is the magnetic flux through the surface : A magnetic field has a magnitude of 0.0686 T and is uniformover a circular surface whose radius is 0.166 m. The field isoriented at an angle of φ = 20.1o with respect to the normal to the surface. What is the magnetic flux through the surface?

What is the speed of aball at that point : A 500 gram ball swings in a vertical circle at the end of a 1.5 mlong string. When the ball is at the bottom of the circle,the tension of the string is 15 N. What is the speed of aball at that point?

Filament of anincandescent lightbulb is a thin tungsten wire : The filament of anincandescent lightbulb is a thin tungsten wire. Suppose a lightbulbhas a resistance of 42 Ω at room temperature. During normal operation, the filament reaches atemperature of about 2990 K.

Two metal spheres-each of radius-center-to-center separation : Two metal spheres, each of radius 2.5 cm, have a center-to-centerseparation of 2.6 m. Sphere 1 has a charge of +1.4 x10-8 C; sphere 2 has a charge of -2.7 x 10-8C. Assume that the separation is large enough for us to assume that the charge on each sp..

A sun yacht is a spacecraft with a large sail : A "sun yacht" is a spacecraft with a large sail that is pushed by sunlight. Although such a push is tiny in everyday circumstances,it can be large enough to send the spacecraft outward from the Sunon a cost-free but slow trip. Suppose that the spa..

Compute the average force the club exerts on the ball : A golf ball of mass 4.50 x 10-2kg is struck by a club. Contact lasts 2.39 x 10-4 s, and theball leaves the tee with a horizontal velocity of 40.0 m/s. Compute the average force the club exerts on the ball by finding its average acceleration.

Find the magnitude of the induced emf in the coil : A coil is wrapped with 195 turns of wire on the perimeter of a square frame of sides 16.9 cm. Each turn has the same area, equal to that of the frame, and the total resistance of the coil is 2.04 . A uniform magnetic field is turned on perpendicul..

User Account

All Pages