Monday, 12 January 2015

Literature Review (Different types of lighting systems suitable for SST)

1. Is there a device that sends a constant voltage to a light bulb so that we can test bulb luminosity with a constant voltage?
We intend to use a voltmeter to measure and adjust the voltage for the bulbs.
2. How do the different lighting systems produce light?
LEDs contain a diode that emits light when sufficient voltage is applied as the electrons recombine with the electron holes to release energy in the form of photons.
Incandescent bulbs contain a filament usually made mostly of tungsten which heats up and gives off light when an electric current is run through it.
For fluorescent lights, an electric current in the gas excites mercury vapour which produces short-wave ultraviolet light that then causes a phosphor coating on the inside of the light to glow.
3. What was the power usage in Singapore per capita?
Screen Shot 2015-01-07 at 12.42.12 pm.png
This image shows the power usage in Singapore per capita since 1970 compared to other countries. As shown in the line graph, Singapore uses a lot more electricity per capita compared to neighbouring countries like Malaysia, Hong Kong and China. This is an even greater reason for Singapore to conserve electricity.
Image Credit: https://www.google.com.sg/publicdata/explore?ds=d5bncppjof8f9_&met_y=eg_use_elec_kh_pc&idim=country:SGP:HKG:MYS&hl=en&dl=en#!ctype=l&strail=false&bcs=d&nselm=h&met_y=eg_use_elec_kh_pc&scale_y=lin&ind_y=false&rdim=region&idim=country:SGP:MYS:CHN:HKG&ifdim=region&tdim=true&hl=en_US&dl=en&ind=false

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