Students record their observations about the teacher demonstration of artificial light sources. Their observations might include: Source Fluorescent Halogen Incandescent LED or other (tube and/or CFL) Observations: White bulb (may Quartz Pear-shaped Curved bulb be tubular or envelope bulb with What does the Light brightness spiral) encasing a filament inside globe look like? (lumens) tungsten Available in a Light is brighter requires fewer How strong is filament variety of colour with more watts watts the light? temperatures, Produces a (energy) Popular colours What colour is for example: bright, white Produces a are warm, soft the light? warm white, light warm, and bright white cool white, Does it emit Gets very hot light daylight They do get hot heat? but produces Emits heat but the heat is Emits less heat bright light (most of the pulled away by than electrical a heat sink in incandescent energy is the base of the globe converted to bulb and A 12-W CFL heat rather than dissipates into has a light light) the air output of 750 lumens (comparable to 60-W incandescent bulb) Part 2 KWL about artificial light sources/globes. Students record individual responses under the following headings: Know: Everything I already know about the different types of light globes/sources Want to know: What do I want to find out the different types of light globes/sources? Learnt: What did I learn about light globes/sources? Worksheet 5: Group research task Students work in groups to research the different light sources and record information in the table provided. They may use student Resource 1 and research sites listed in Activity 3. Examples of possible answers Light source Fluorescent Halogen Incandescent LED or other
Students record their observations about the teacher demonstration of artificial light sources. Their observations might include: Source Fluorescent (tube and/or CFL) Halogen Incandescent LED or other Observations: What does the globe look like? How strong is the light? What colour is the light? Does it emit heat? White bulb (may be tubular or spiral) Available in a variety of colour temperatures, for example: warm white, cool white, daylight Emits less heat than incandescent globe A 12-W CFL has a light output of 750 lumens (comparable to 60-W incandescent bulb) Quartz envelope encasing a tungsten filament Produces a bright, white light Gets very hot but produces bright light Pear-shaped bulb with filament inside Light is brighter with more watts (energy) Produces a warm, light Emits heat (most of the electrical energy is converted to heat rather than light) Curved bulb Light brightness (lumens) requires fewer watts Popular colours are warm, soft and bright white They do get hot but the heat is pulled away by a heat sink in the base of the bulb and dissipates into the air Part 2 KWL about artificial light sources/globes. Students record individual responses under the following headings: Know: Everything I already know about the different types of light globes/sources Want to know: What do I want to find out the different types of light globes/sources? Learnt: What did I learn about light globes/sources? Worksheet 5: Group research task Students work in groups to research the different light sources and record information in the table provided. They may use student Resource 1 and research sites listed in Activity 3. Examples of possible answers Light source Fluorescent Halogen Incandescent LED or other
unit-of-work-yr8-light-up-the-globe.docx