Working out kelvin ?

[Shane l]

Hey since I am in south Africa they don't sell bulbs measured in kelvin here only in watts which doesn't really help so I spoke to my physics teacher about it an he told me you can measure the temperature of the globe and times it by 273 so what I did was take my tank thermometer and stuck it to the lid near my light an got a temperature in degrees celsius and did the calculation I'm not sure about the calculation for (f) but hope this helps

 

[danielt]

Don't you add 273 from your temperature reading if it is celcius, not multiply? 0 kelvin is -273C. I may be mistaken :s