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?
(.0042 / 0.15) * 100%
2.8%
To calculate the efficiency of a photovoltaic cell, we need to use the formula:
Efficiency = (Electric Energy Output / Light Energy Input) x 100
Given:
Electric Energy Output = 4.2×10−3 W
Light Energy Input = 0.15 W
Let's substitute the values into the formula:
Efficiency = (4.2×10−3 / 0.15) x 100
Efficiency ≈ (0.028 / 0.15) x 100
Efficiency ≈ 0.1867 x 100
Efficiency ≈ 18.67%
Therefore, the efficiency of the photovoltaic cell is approximately 18.67%.
To find the efficiency of the photovoltaic cell, we need to calculate the ratio of electric energy output to the light energy input. The efficiency (η) is given by the formula:
η = (Electric energy output / Light energy input) × 100%
Given:
Electric energy output = 4.2×10^(-3) W
Light energy input = 0.15 W
Substituting the values into the formula, we get:
η = (4.2×10^(-3) W / 0.15 W) × 100%
Now, let's calculate:
η = (4.2×10^(-3) / 0.15) × 100%
η = (0.0028 / 0.15) × 100%
η ≈ 0.0187 × 100%
η ≈ 1.87%
Therefore, the efficiency of the photovoltaic cell is approximately 1.87%.