PC Cell Efficiency: Find Power (in W)

AI Thread Summary
To calculate the power produced by a photovoltaic cell with an area of 80 sq cm and an efficiency of 7% under sunlight intensity of 800 W/sq m, the area must be converted to square meters, resulting in 0.008 sq m. The power output is calculated using the formula: power = intensity × area × efficiency. Substituting the values gives power = 800 W/sq m × 0.008 sq m × 0.07, which equals 0.448 W. The discrepancy with the book's answer may stem from unit conversion errors or misinterpretation of the area measurement. Proper unit conversion is crucial for accurate calculations.
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Homework Statement


A photovoltaic cell has area 80 sq cm and efficiency converting energy in the form of sunlight to electricity of 7%. The sun's intensity is 800 W / sq m and the rays are perpendicular to the cell's surface.
What power will be produced by this cell (in W)? Take care in converting to SI units.


Homework Equations



=(intensity)(area)

The Attempt at a Solution


80*10^-2 *.07 * 800 = 44.8

but the back of the books says the answer is .45
 
Physics news on Phys.org
1 cm = 10-2 m

(1 cm)2 = (10-2 m)2 = ?

Cheers.
 

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