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# Solar Products: Calculating The Number Of Solar Cells Needed To Produce 9 V Of Energy? (5/20/2012)

In lab, we made a 1sq in solar cell which produced a potential voltage of 0.5 V outside in direct sunlight.

How many cells would be needed to produce the equivalence of a 9 V battery?

I know by using proportions, that the answer is 18, and from a mathematical standpoint it’s correct…but my lab instructor doesn’t like seeing it solved that way. I know that it’s the same as writing out the fractions to get 18 on the right hand side, however, I can’t seem to figure it out today. Any help would be much appreciated!

this is how I found my original solution

(1cell/0.5V) = (x/9V)

(9V*1cell) = x*(0.5V)

x = (9V*cell)/(0.5V) —> volts cancel and gives you 18 cells, or 18 in^2 of solar cells.

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how would you write it out (and get 18) as a product of fractions?

(A/B)*(B/C)*(C/1) = A or something like this, where A = 18 volts.

***Thanks for all of your help!! I appreciate it!!!***

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roderick_young May 20, 2012 at 4:08 pm

If your instructor wants it solved in a particular way, you should check with him or her for the process.

I would approach it as follows, but this may not meet the requirements of your class:

let n = number of cells

(n cells) x 0.5 volts/cell = voltage = 0

n x 0.5 = 9

n = 18