# EM average power output

#### Dx

Hi!

Estime the average power output of the sun, given that about 1350 W/m^2 reaches the upper atosphere of the Earth. the distance from the Sun to the Earth is 1.5 x 10^11m

I have the formula E_o = [squ]2S/e_oc. This is what I have thus far...
E_o = [squ]2(1350W/m^2)/8.85x10^-12C^2/Nm^2)(.x10^8 m/s) = 312V/m.
I am lost on my calculations can someone help me solve for this,plz
Thanks!
Dx

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#### Tom Mattson

Staff Emeritus
Gold Member
I don't know what that formula is supposed to be, but what you have to do is recognize that the power is radiated (approximately) spherically symetrically. You should be able to calculate the area of the sphere centered on the Sun and passing through the Earth. Once you get that, you can use the given information to calculate the power output.

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