Flux vs Power Query - Explained

[lavster]

Hi,

my understanding of flux is that it is the amount that flows through per unit area per unit time. with this in mind, why is the flux (of photons I am assuming) from a light bulb equal to the power, which is the energy per unit time?

Thanks

 

[Dr Lots-o'watts]

Because energy is directly related to the number of photons. The energy of one photon is E(of one photon) = hf. So for 2 photons, E(of 2 photons) = 2hf, and so on. (f is the frequency of the photon)

www.gentec-eo.com

 

[lavster]

thanks :) however it says nothing about the area? is it not meant to b per unit area? so the dimensions are wrong?

 

[K^2]

You can have flux per area, flux per solid angle, and total flux. You really have to look at the context to figure out which one it is.