Scientific Electrodes take Tungsten filament Thin tungsten Movement of principles applied electrical energy encased in a filament with a electrons in a and generate quartz envelope high resistance to semiconductor. moving electrons, of a halogen gas, electricity, LEDs are part of collide with a variation of the becomes white the family of ‘solid mercury in the incandescent hot and gives out state’ electronic tube to make UV globe light components that light. The white only allow phosphor coating electricity to flow of the tube in one direction, converts the UV with the side light into visible effect of creating light that we can light when current see. is passed through them. Advantages Energy efficient Produce a Cheap to Most energy (produces that efficient option between 66% is intense and Long life span and 75% less bright (50 000 hours) heat than Work well in equivalent Produce a cold climates incandescent light in a bulb) Mercury free variety of brightness and Moderately long Somewhat more colour life (life span energy efficient temperatures 10–12 times than that of an incandescent Low operational incandescent bulbs costs bulb) Mercury free Reasonably Do not get hot priced CFLs use only 20% of the electricity of traditional incandescent bulbs to produce the same amount of light less energy means lower electricity bills.
Scientific principles applied Electrodes take electrical energy and generate moving electrons, collide with mercury in the tube to make UV light. The white phosphor coating of the tube converts the UV light into visible light that we can see. Tungsten filament encased in a quartz envelope of a halogen gas, a variation of the incandescent globe Thin tungsten filament with a high resistance to electricity, becomes white hot and gives out light Movement of electrons in a semiconductor. LEDs are part of the family of ‘solid state’ electronic components that only allow electricity to flow in one direction, with the side effect of creating light when current is passed through them. Advantages Energy efficient (produces between 66% and 75% less heat than equivalent incandescent bulb) Moderately long life (life span 10–12 times that of an incandescent bulb) Reasonably priced CFLs use only 20% of the electricity of traditional incandescent bulbs to produce the same amount of light less energy means lower electricity bills. Produce a that is intense and bright Work well in cold climates Mercury free Somewhat more energy efficient than incandescent bulbs Cheap to Most energy efficient option Long life span (50 000 hours) Produce a light in a variety of brightness and colour temperatures Low operational costs Mercury free Do not get hot
unit-of-work-yr8-light-up-the-globe.docx