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I have an equation:

[tex]L = \sigma T^{4} * 4 \pi R^{2}[/tex]

Which I fill with values and units

[tex]L=5.67*10^{-8} * (5860K)^{4} * 4 \pi * (6.96*10^{8}m)^{2}[/tex]

and I get an answer:

[tex]4.07*10^{26} K^{4} m^{2} [/tex]

The correct answer is:

[tex]4.07*10^{26} watts [/tex]

I don't understand the relationship between meters, Kelvins, and Watts. How do I properly combine or cancel the units to arrive at Watts?

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# Homework Help: Units - Watts, meters & Kelvin

**Physics Forums | Science Articles, Homework Help, Discussion**