Experiment 4 (Demonstration) Electrical Resistance

How many teachers does it take to break a light bulb?

Electrical Resistance in a Glass Bulb

Materials and Supplies:

six volt flashlight bulb
ceramic base for light
ohmmeter
2 alligator clips with wires
gas burner

Procedure:

1. Screw the 6 volt light bulb into a miniature ceramic light socket.

2. Break away the glass surrounding the filament.

3. Cut the filament that connects the two electrodes in the bulb.

4. Carefully remove the filament and do not damage the small glass bead that
connects both electrodes just below the filament.

5. Hook the ohmmeter to the contacts on the base of the ceramic light socket.

6. Gently heat the glass bead while recording the resistance.

7. Record the resistance and time at 10 second intervals (if possible).