Question

The efficiency of a solar cell is 20% and its surface area is $4{cm}^2$. Find the electrical energy generated in one second, by 3000 cells, connected in a solar panel, if $640J$ of solar energy is incident on one meter square area, in one second.

• A. 183.6 J
• B. 153.6 J
• C. 193.6 J
• D. 123.6 J

Answer 1

The correct option is B 153.6 J

The total surface area of solar cells on which solar energy is falling = area of each cell $\times$ number of cells $=4\times 3000{cm}^2=1.2m^2$
The solar energy falling on 3000 cells
$Q_1=1.2\times 640J=768J$
The energy converted into electric energy $=\frac{20}{100}\times 768=153.6J$
The electric energy generated in one second is $153.6J$