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Name: Stephen
Status: student
Age: 15
Location: N/A
Country: N/A
Date: 2000-2001

I'm doing an experiment which involves how the change of angle of a solar panel will affect the output it'll produce. The light source is an open 6 Watts light bulb, and a voltmeter will be connected to the solar panel to measure the output. Can you tell me what I can expect if the degree changes? And is there any formulas which I can use to measure the output whilst the change in degree?

There is a formula for the relative intensity of radiation as a function of the angle of incidence A (measured from the panel), so directly overhead corresponds to an angle of incidence = 90 degrees. The relation is just sin(A). However, it is a bit more complicated beause the illuminated area of the panel increases as the angle of incidence decreases. You can find a detailed treatment on the website:

Vince Calder

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