PROBLEM: Are all light bulbs the same inside? Why or why not?

PREDICTION:

MATERIALS: 4 different light bulbs, microscope

PROCEDURE: Look at light bulbs at your station and draw the inside of the bulb. You may use a microscope. Make sure that the filament is 5.5 cm away from the objective. Remember the bulbs are glass. HANDLE WITH CARE. Label the following: glass, filament. Trace the flow of the electrons through the light bulb in each of the pictures.

Your teacher has a light bulb that is producing light. Look and see if you can determine what produces the light. Use the following space to make notes.

 

 

CONCLUSIONS: Why do light bulbs have different filaments?