Question

A typical photovoltaic cell delivers 4.2×10−3 W of electric energy when illuminated with 0.15 W of light energy.What is the efficiency of the cell?

Answer 1

2.8 %

Step-by-step explanation:

Power deliver by the cell = 4.2 x 10^-3 W

Power given to the cell = 0.15 W

The efficiency of the cell is defined as the ratio of power deliver by the cell to the power given to the cell.

So, the efficiency of the cell

= power deliver by the cell / power given to the cell

=
`(4.2*10^(-3))/(0.15)`

= 0.028

in percentage form = 0.028 x 100 % = 2.8 %

Thus, the efficiency of the photo voltaic cell is 2.8 %.