HEAT FROM LIGHT BULBS Ashley Blake Powell Science Fair 2007

Experiment Determine the effects of different watt light bulbs and fluorescent lights on the production of heat. Which bulbs put off more heat?

Lights Being Tested Incandescent light Bulbs 25 watt 40 watt 75 watt 100 watt 150 watt Fluorescent light Bulbs 7 watt 23 watt

Class Pole? Which Bulbs Do You All Think Will Put Off The Most Heat?

Materials Needed Goose-neck lamp Extension Cord Incandescent Bulbs: -25, 40, 75, 100, 140 watt bulbs. Compact Fluorescent Light Bulbs: -7 and 23 watt bulbs Thermometer Ruler White Towel Stop Watch Paper and Pencil to record Results

Procedures 1)Put the towel on a flat table. 2)Put the lamp on the end of the towel. 3)Place the thermometer under the light. (on towel) 4) Set the bottom on the bulb, so that it is 12 inches form the thermometer.

Procedures cont. 5 ) Make sure lamp is unplugged and screw in the smallest wattage light bulb. (25 watt bulb) 6)Measure and report the starting temperature. 7)Turn lamp on and leave lamp on over thermometer for five minutes. 8) Turn lamp off and record the temperature.

Procedures Cont. 8) Allow the lamp and desk to cool down between testing each light bulb. 9)**Do not unscrew the light bulb right after turning off the lamp it may be very hot. 10) Unplug the lamp each time before changing the bulb.

Procedures Cont. 11) Keep the distance between the bulb and the thermometer the same for each light bulb. 12)The starting temperature should be about the same before each test.

Procedures Cont. Test the remainder of the bulbs each following all directions. (1-12) ***Test each bulb two times***** -40 watt -75 watt -100 watt -150 watt Fluorescent -7 watt -13 watt

Chart BulbStart temp Ending temp Start temp Ending temp 25 watt 40 watt 75 watt 100 watt 150 watt Compact Fluorescent 7 watt 23 watt

Background The higher wattage of the light bulb the higher the temperature. A compact fluorescent bulb gives off very little heat because they do not us resistance and cause a light to glow hot. Incandescent lights give off heat as well as light energy.

Background In the incandescent lights electrical current pass through a thin filament, in turn heating it and causing to become excited. Incandescent lamps convert approx. 90% of the energy they consume into heat. The compact fluorescent bulb convert only approx. 30% of energy into heat.

FLaReS Falsifiability: You could test the heat given off at a farther distance. Test the heat given off in an enclosed space, such as a room. Test in an area that is not in direct line of the lighting source.

Logic Logic: Because of the structure of the light bulb and ability to convert energy into heat at different percentages, it is logical. Heat is produced as a result of energy being created.

Replicability An experiment with detailed instructions was given, as a result the test can be recreated. If the material and items needed are obtained a test can be conducted.

Sufficiency The experiment is sufficient because an experiment has been conducted. The results are accumulated in the chart for further observation.

The End Further tests can be completed. Thanks for your undivided attention If you have any questions I will try my best to answer them.