Electric Resistance

Practice

practice problem 1

A standard 60 W 120 V light bulb has a tungsten filament that is 53.3 cm long and 46 μm in diameter.
  1. What is the light bulb's operating resistance?
  2. Determine the cross sectional area of the filament.
  3. Determine the resistivity of tungsten.
  4. How does the resistivity calculated above compare to the value quoted in standard reference tables? Why are these two values so different?
  5. How can a 53.3 cm filament fit into a light bulb that is only a few centimeters wide?

solution

  1. Answer it.
  2. Answer it.
  3. Answer it.
  4. Answer it.
  5. Answer it.

practice problem 2

Write something.

solution

Answer it.

practice problem 3

Write something.

solution

Answer it.

practice problem 4

Write something completely different.

solution

Answer it.

The Physics Hypertextbook

  • No condition is permanent.