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# physics question help! watch

1. If this is from Edexcel AS Physics then I think that in the book it tells you the energy from the sun strikes the earth's surface at 1000 Wm-2 (stupidly doesn't point this out in the book but is in a worked example on the same page...) then what do you do?
2. (Original post by lukearos)
If this is from Edexcel AS Physics then I think that in the book it tells you the energy from the sun strikes the earth's surface at 1000 Wm-2 (stupidly doesn't point this out in the book but is in a worked example on the same page...) then what do you do?
Are you really doing physics? This thread is 5 years old.

The Pod needs 4.4W.

If the solar cell produces 1kW / m2 on average, the iPod needs (4.4/1000) m2 to produce 4.4W with the solar cell operating at 100% efficiency.

EDIT:

If the question told you that the cell was less than 100% efficiency (because real solar cells do not work at 100% efficiency), . you would need to estimate the conversion efficiency and use that conversion factor to get the actual area needed. Once you have that, take the square root and that will give you the length of side of a square panel in metres. Convert to cm / mm as appropriate.

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