A typical photovoltaic cell delivers 3.8×10−3 {\rm W} of electric energy when illuminated with 0.14 {\rm W} of light energy.
what is the energy efficiency of the cell?
you put 1.4 *10^-1 in
you get 3.8*10^-3 out
in percent that is
3.8^10^-3 * 10^2/1.4*10^-1
= (3.8/1.4) 10^0
= 2.7 percent
thanks
To calculate the energy efficiency of the photovoltaic cell, we need to determine the ratio of output energy to input energy.
First, let's determine the output energy. The problem states that the photovoltaic cell delivers 3.8×10^(-3) W of electric energy when illuminated with 0.14 W of light energy. This means that the output energy is 3.8×10^(-3) W.
Next, let's determine the input energy. The problem states that the cell is illuminated with 0.14 W of light energy. Therefore, the input energy is 0.14 W.
Now, we can calculate the energy efficiency using the following formula:
Energy Efficiency = (output energy / input energy) x 100%
Plugging in the values, we have:
Energy Efficiency = (3.8×10^(-3) W / 0.14 W) x 100%
Energy Efficiency = (0.0027) x 100%
Energy Efficiency = 0.27%
Therefore, the energy efficiency of the photovoltaic cell is 0.27%.