Demonstration Everyone pay attention up front to a display of various lights. Compact Fluorescent Lamp (CFL)
{"Image DocumentName": "DemonstrationEveryone pay attention up front to a display of various lights. Compact Fluorescent Lamp (CFL)", "Image ImageDescription": "The Light Bulb Display Activity (5 min, slide 18) Student 2: {Make sure that the light bulb display is sitting at a table/desk at the front of the class where it can be seen, and that it is plugged in. At this time, all the lights should be off.} Student 1: {While Student 2 is making sure the display is ready} So I have here with me today a lighting display with three types of lights. Can anyone tell me what these types of lights are called? {Wait for answers, call on students. Explain again what each type of light is called (incandescent, compact flourescent (CFL), and LED lights) whether they gave the right answer or not.} Student 2: Well who can tell me which one is the least efficient? {Wait for answers, some will probably identify the incandescent.} Great! That\u2019s right. And right now we\u2019re going to demonstrate why. Can I get a couple volunteers to come to the front of the class? {Guide the volunteers up the front next to the lighting display.} Student 1: Thanks for volunteering! {Turn on the CFL and the incandescent - warn the students it might be bright first.} Now, I want both the volunteers to put their hands close to both the CFL and the incandescent - but don\u2019t touch the bulb! Do you feel a difference between the two bulbs? {Both will probably say something along the lines of, the incandescent is much warmer than the CFL.} Exactly, the incandescent is much warmer than the CFL. Student 2: Great, now what\u2019s the difference between these two? {Turn on the LED and turn off the incandescent, keep the CFL on.} Right - the LED is even cooler than the CFL. Can anyone tell me why these bulbs have different temperature levels? {Direct this question to the whole class. Wait for answers from students, if they have any, regardless of whether you get the right answer or not make sure you repeat the correct answer aloud so the whole class can hear.} The hotter the bulb is, the more energy its wasting as heat rather than light. So the LED light and the CFL are much more efficient that the incandescent bulb is, because they use less energy just creating light, rather than having to use extra energy heating the lamp as well. {At this point, you can let the volunteers go back to their seats.} Student 1: Exactly. That\u2019s why if you see any of these guys {gesture to the incandescent bulb} in your house, try and swap them out for a CFL immediately. CFL\u2019s are inexpensive and are the easiest swap for incandescent bulbs. Light-emitting Diode (LED) Incandescent.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}