# Square Meters of Solar Cells Highway call boxes use PV cells for power. By assuming that each PV cell has an area of 0 .16 m 2 , calculate how much power it provides to the call box. As in the previous example, assume that solar power is 1 .0 × 10 3 W/m 2 and that the cells are 15% efficient. ### Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692

#### Solutions

Chapter
Section ### Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 10, Problem 10.2YT
Textbook Problem
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## Square Meters of Solar CellsHighway call boxes use PV cells for power. By assuming that each PV cell has an area of 0 .16 m 2 , calculate how much power it provides to the call box. As in the previous example, assume that solar power is 1 .0 × 10 3  W/m 2 and that the cells are 15% efficient.

Interpretation Introduction

Interpretation:

The power provided by a cell to the call box is to be calculated.

Concept Introduction:

Solar cell is a type of device that is used to convert solar energy into electricity. It is also known as photovoltaic cell.

The percent efficiency is given by:

% efficiency=Output powerInput power×100%

### Explanation of Solution

Since the cells are 15% efficient. The total active area of a cell is 0.16 m2.

The solar energy falls on the active area at the rate of 1×103 W/m2. So, the input power is calculated as follows:

Input power=0.16 m2×1×103 Wm2=160 W

Therefore, the input power is 160 W

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