Contents
Cal Poly Pomona
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Physics Demonstrations at Cal Poly Pomona

Demo Index:
    EM-D-RF
Pira Index:
    5D 20.30
Title:
    RESISTANCE OF BULB FILAMENT
Description:
    Demonstrates that the resistance of a lamp filament rises as the temperature increases.
Equipment:
    1. Demo multimeter (large display)
    2. Special lamp box w/switch
    3. 100 watt blue flood lamp
    4. Probe leads
    5. Plug strip








    Hand out card in back pocket w/ equipment
Procedure:
    1. Set up equipment as shown with the lamp box plugged into an electrical outlet.
    2. Plug the probe leads from the lamp box into the V/O and Com receptacles. Set the demo meter, on the left side, to read ohms.
    3. Notice the resistance reading with the cool light bulb.
    4. Push the switch on the lamp box to momentarily turn the light on. Release the switch and notice the resistance reading of the hot light bulb.